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Tao Zhang, Jinyan Zhan, Feng Wu, Jiao Luo, Juan Huang, "Regional Climate Variability Responses to Future Land Surface Forcing in the Brazilian Amazon", Advances in Meteorology, vol. 2013, Article ID 852541, 9 pages, 2013. https://doi.org/10.1155/2013/852541
Regional Climate Variability Responses to Future Land Surface Forcing in the Brazilian Amazon
Tropical deforestation could destabilize regional climate changes. This paper aimed to model the potential climatological variability caused by future forest vulnerability in the Brazilian Amazon over the 21th century. The underlying land surface changes between 2005 and 2100 are first projected based on the respectable output produced by Hurtt et al. Then the weather research and forecasting (WRF) model is applied to assess the impacts of future deforestation on regional climate during 2090–2100. The study results show that the forests in the Brazilian Amazon will primarily be converted into dryland cropland and pasture in the northwest part and into cropland/woodland mosaic in the southeast part, with 5.12% and 13.11%, respectively. These land surface changes will therefore lead to the significant reduction of the sum of sensible heat flux and latent heat flux and precipitation and the increase of the surface temperature. Furthermore, the variability of surface temperature is observed with close link to the deforested areas.
Anthropogenic climate changes have attracted worldwide concerns. The coupling mechanism between land surface vulnerability and hydrological and climatological variability has been increasingly investigated and assessed during the last decades [1–4]. Generally, changing in human dominated land use or natural vegetation covers has affected the climate conditions through biogeophysical and biogeochemical processes, by shifting the surface energy, thermodynamic momentum, moisture budget, and atmospheric components [5–9]. Large-scale land conversions, such as unprecedented urban area expansion [10, 11], intensified agricultural activities [12, 13], and high tropical and boreal deforestation rate , are mainly caused by the human land use practices directly or indirectly, which is to meet the demand of human immediate necessities [15–20]. As a result, these land conversions have had great corresponding repercussions on climate anomalies at different scales, as well as other adverse effects in terms of biodiversity decline, ecosystem degradation, and economic loss . Though most current global climate concerns are focused on the first-order external forcing , such as the concentration of carbon dioxide (CO2) which primarily originated from the fossil fuels combustion and anthropogenic land use practices, the land surface changes which have influenced or will influence natural climate variability in history, current, and future have fascinated diverse community of scholars .
Forests, covering more than 30% of terrestrial land [1, 24], mainly comprise tropical, temperate, and boreal types from which invaluable ecological, socioeconomic, and mental public goods and services are provided for humanity. Furthermore, Forests can also affect multiscale climate by exchanging the planetary energetics, sustaining the hydrologic cycle, containing and releasing the carbon dioxide and through other physical, chemical, and morphological processes , which thus play an indispensable role in balancing the humanity, climate, and land surface systems at different temporal and spatial scales through the complicated and nonlinear interactions [25–28].
Among these forest types, tropical forest occupies nearly 20% of total forest land area and appropriates more than 30% of net primary production (NPP) in the terrestrial ecosystem. This outstanding biomass can sequester a great deal of CO2, maintaining above 25% on land surface , which doubles or triples that of temperate and boreal forests [1, 30, 31]. Well-functioned tropical forest could effectively accelerate the evapotranspiration rate, cool the atmospheric temperature, and increase the rainfall . Some earlier experimental simulations in which the tropical forest was entirely replaced with low coverage vegetation [29, 33–37] suggested that these changes would induce increase in surface temperature, in comparison to the decrease of precipitation, evapotranspiration, soil moisture, and cloud cover caused by the increase of surface albedo and decrease of surface roughness. Though tropical forest could mitigate surface warming through considerable evaporative cooling effect, the temperature would increase if the surface albedo rose to a large extent induced by deforestation which would offset the water and energy exchange feedback effects, compared with the reduction of convection and precipitation . Therefore, no debate of this issue would be complete without taking the tropical forest as a significant component into account in climate change researches.
The Amazonia tropical forest with an area of 6 million km2, nearly 80% of its original area, covers half of the global remaining tropical forests, and approximatly 60% is located in the Brazilian Amazon region. The annual average forest clearing rate in Brazil has accelerated in the past 15 years and shown a decrease trend in recent years, from km2 in 1990–1994 to above km2 in the next two years, then to km2 until 2005 and less than km2 in 2011 [39–41]. The quality of forest has also experienced a significant loss (Table 1). Given the massive ecological services in water maintain and climate regulation, the annual average precipitation in Amazon reaches 2,500 mm, and it can discharge over a trillion m3 of water into the ocean. Without these tropical forest featured by low albedo, great radiative forcing, and high evapotranspiration rate, the local residents should not have had such habitable zones with a cool and wet boundary . Although the tropical forests are an indispensable component of regional ecological system and humanity, anthropogenic activities have caused the shift of climatic states by disturbing and clearing the tropical forest . This land surface change would destabilize regional climatic and hydromeoterological variability [30, 44] and then induce the climate anomalies such as changing in precipitation and temperature [44, 45].
Numerous researches have been conducted to assess the potential climatological changes of tropical deforestation in (Brazilian) Amazon using the global or regional climate models [28, 46, 47] and shared a common view that the vast tropical forest plays a pivotal role in changing climatic conditions. But these studies are lacking thorough and profound investigation due to the demerits of numerical models and data availability. As to the global climate models (GCMs), its rough resolution is inappropriate to reveal the land surface-atmosphere interactions for regional simulation cases. Importantly, it is worth pointing out that the entire Amazon forests have been entirely converted into low coverage vegetation in terms of pasture, savanna, and cropland in the GCMs performances. Though this unrealistic replacement assumption could help to understand the importance of tropical deforestation to regional and global climate changes as a whole, it is unable to help revealing the regional anthropogenic climate changes mechanism. In contrast, although the regional climate models (RCMs) with higher resolution are better at revealing the mesoscale effects of land surface changes on regional climate variability, the potential climate uncertainties induced by future land surface modification and vegetation alteration are still far from known.
Thus, the scientific objective of this paper is to estimate the potential impacts of future tropical deforestation on regional climate changes in Brazilian Amazon during 2090–2100, with the performance of a high resolution numerical model-weather research and forecasting (WRF) model. For this purpose, a relative rational underlying land surface with high resolution should be projected first. Given the observations and investigations which showed that remarkable progress in curbing tropical forests recession has been made in recent years as previously mentioned, the prevailing unreasonable land surface scenarios in which the entire forests were replaced with low coverage vegetation would not be used in this paper. We analyzed the characteristics of forest land transformation between 2005 and 2100, and then the land surface map in particular years could be identified. Thereafter, the control and simulation experiments are designed for WRF performance.
2. Data and Methodology
The data used in this paper include land surface data and lateral forcing conditions. The respectable land cover product, generated by the GCAM model under the implementation of the state-of-the-art Representative Concentration Pathway scenarios (RCPs), is used to analyze the characteristics of land cover conversions, such as the changing trend and the fraction, which is critical to project the future land surface properties [48, 49]. These data harmonized the historical land uses and the future land surface scenarios for studying the anthropogenic impacts and the annually fractional landscape patterns and land surface transitions for the period 1500–2100 at resolutions. For the purpose of this study, the forest land conversions during the period from 2005 to 2100 will be identified.
There are three steps to predict and generate the future land surface map. Firstly, the fraction of transitioned cell that converted from the primary forest and the secondary forest into other land cover types, including cropland, pasture, and built-up land, was calculated to capture the changing characteristics at temporal and spatial scales between 2005 and 2100. Then the transformation thresholds were set to identify the targeted grid cells with vast changed area. The fraction thresholds of grid cells that converted from forest land to dryland cropland and pasture (pasture) and cropland/woodland mosaic (woodland) were 0.15 and 0.02, respectively. The grid cell would be considered converting from forest to pasture if both thresholds were reached. Finally, label and replace the initial land surface map in 2005, which is processed with USGS land cover classification at the resolution of and will be used in the control experiment, with corresponding targeted land cover types. By doing this, a relative reasonable future land surface in 2100 is generated as compared with that of most researches in which replacing the entire tropical forest with cropland or savanna vegetation types . Thereafter, a rectangle region was selected as the study area covering the changed grid cells as many as possible (Figure 1). High resolution with this grid size can also help to reveal the land-atmosphere interactions as well as the cumulus parameterization and weather.
The lateral boundary forcing data is created by and obtained from the Centre for Environmental Prediction (NECP) and covered 6 hours temporally, with the spatial resolution of (longitude latitude) and the vertical resolution of 27 pressure layers. As mentioned above, the USGS land use and land cover system is used to determine the topography information and land surface physical properties. The buffer zone of the lateral boundary is set to 4 layers of grid points. The WRF model integrates at a 5-minute step, as well as the cumulus convection processes operation, but run the radiation process at a 0.5 hour step.
2.2. WRF Model and Experiments
The Advanced Research WRF model (ARW-WRF, version 3.3) is used in this study. Created by key institutions involving National Center for Atmospheric Research (NCAR), Air Force Weather Agency (AFWA), National Oceanic and Atmospheric Administration (NOAA), ARW-WRF model is a fully compressed nonhydrostatic equation model, including the prognostic variables referred to wind, perturbation, and other scalars, and it is possible to mix the dynamic cores and model physics packages [50, 51]. To assess the model performance, the land cover data and meteorology data in 2010 are used to validate and calibrate the model parameterization. The results illustrated the ability of WRF model to evaluate the impacts of land surface changes on climate variability. Since the study area was selected, the WRF model is set up with a grid of cells, and each one representing a area, centered at 5°S, 56°W.
For assessing the impacts of deforestation on climate, other variables were controlled but to modify the land surface map and relative properties in the model scheme. To achieve this goal, two experiments were designed, including the control experiment and simulation experiment. In the control experiment, which is regarded as the reference case, the current land surface map in 2005 is used as the basic land cover data, maintaining constant in the whole simulation process. By contrast, the simulation experiment is designed with the implementation of project land surface map in 2100 in which certain numbers of grid cells are converted from the forests into dryland cropland and pasture (pasture) and cropland/woodland mosaic (woodland) (Figure 1). This replacement will result in changing of corresponding biogeophysical parameters such as root depth, canopy height, and other variables in the WRF model. The climatic metrics in terms of sensible heat flux, latent heat flux, precipitation, and temperature in two experiments are simulated and processed into annual domain-averaged variables during the simulation period of 2090–2100, and the differences of each climate metric between two experiments are also modeled.
3. Results and Discussion
3.1. Future Land Surface Properties
In the Brazilian Amazon, the entire forest accounts for 78.07% of the total area in the year 2005, totally contributed by the evergreen broadleaf forest. According to the statistical analysis, the projected deforested land occupies 18.23% of the study area during the period from 2005 to 2100. The ratios of cells in which forest is converted into pasture and woodland to the total grid cells in the study area are 5.12% and 13.11%, respectively at the same time. Specifically, the primary forest degrades by 13.36% of the study area, among which 32.04% is converted into the pasture and 67.96% is transitioned into the woodland. The secondary forest decreases by 4.33% in the study area, among which 19.40% is transitioned from forest into pasture and 80.60% into the woodland. Furthermore, the proportion of each cell in which primary forest is converted to pasture and woodland ranges from 0 to 56.51% and from 0 to 20.70%, respectively, from 2005 to 2100, in comparison to those of the secondary forest ranges from 0 to 37.70% and from 0 to 15.31%, respectively. In this study, by considering the potential joint efforts to curb the deforestation in the future that may result in reaching the saturation point of forest clearing rate, we then set quite lower thresholds than current deforestation rate (0.7%). Therefore, the conversion thresholds would have had influences on the future land surface projection.
Figure 1 provides the geographical distribution of changed forest land. The degraded and transitioned grid cells are primarily distributed in the periphery of the entire Amazon, or along the rivers. Particularly, most grid cells in which forests are converted into pasture are mainly located in the northwest part of the study area, where containing a great deal of water resource supplied by the dense water network. By contrast, the cells in which forest is converted into cropland are principally distributed in the most disturbed and populated area, especially the transition zones between forests and other land cover types.
3.2. Heat Fluxes
The yearly averaged sum of sensible and latent heat flux serves as an indicator for estimating the energy exchange between land surface and atmosphere during 2090–2100. Generally, based on the model analysis, deforestation will cause a reduction in surface heat flux with approximate 5 W/m2 per month (Figure 2). In the control simulation, the flux in the east is greater than that in the west, but the eastern area will see a decline in the deforestation simulation. This progressively decrease in the total heat flux illustrates the importance of increase in surface albedo and radiation caused by deforestation. As a result, the annual average sensible heat flux will increase to some extent, especially in the west region covering most changed areas that transited from forest to pasture, while the latent heat flux shows a significant downward trend during the period of 2090–2100. Such spatial gradient of flux will increase the convection by generating a thermally driven circulation, leading to rising of the sensible heat flux over the west part and falling over the east part which will redistribute the temperatures.
3.3. Precipitation and Temperature
On the whole, the annual domain-averaged precipitation will decrease while the temperature will increase during the simulation period. Deforestation in Brazilian Amazon will induce a monthly reduction in precipitation (1.05 mm) and a monthly increase in surface temperature (0.12°C). Figure 2 also shows that the deforestation will cause a significant precipitation reduction in rainy season, but a slight decrease in dry season. Correspondingly, the surface temperature nearly increases to a large extent in rainy season and moderately goes up to a higher level in dry season.
The spatial distribution of differences in surface temperature and precipitation between the control experiment and simulation experiment in 2100 is significantly influenced by the forest land changes. Obviously, the surface temperature increases over the western region, associated with the reduction of precipitation and soil moisture that will reduce the latent heat flux discharge from the land surface into atmosphere. Massive deforested areas experience a significant increase of temperature and decrease of precipitation. However, the spatial distribution of precipitation deviation is not so related to the deforested areas but fragmented in the whole study area. In addition, as can be seen in Figure 3, deforestation will intensify the precipitation shift by increasing its amount in the southeast region even further and decreasing in the northwest region. The precipitation variability can be explained by that deforestation may influence the propagation of squall lines, which will reduce the water supply in these regions. Meanwhile, the convection and speed effects will also impose a negative feedback in these regions.
To study the spatial heterogeneity of these climatic metrics in longitude and latitude direction, the average surface temperature and precipitation in different zones were calculated (Figures 3(c) and 3(d)). Apparently, the surface temperature fluctuates dramatically in the western region and almost remains stable in the eastern part, which means that the surface temperature has a longitudinal distribution characteristic. Meanwhile, the zonally average temperature of north region increases most greatly by 0.0350°C in year 2100 induced by deforestation, while that of central region has a less increment of 0.0272°C, as compared to that of south region with a similar growth by 0.0274°C. For the precipitation, those of the central region and the southern region fluctuate more strongly than that of the northern region. The zonally annual average precipitation in northern region and central region will decrease by 0.433 mm and 0.147 mm, respectively, while it will slightly increase by 0.09 mm in the south region.
Variability of climate is also calculated on each land cover type according to the model results in 2100 with the resolution of (Figure 4). The statistical analysis shows that the average precipitation and latent heat flux of evergreen broadleaf forest will experience a decrease of 0.15 mm and 0.40 W/m2, respectively, while the temperature will increase by 0.02°C. Since forests are converted into pasture and woodland, the corresponding climatic conditions in pasture will have a significant reduction of precipitation and latent heat flux and increase of surface temperature. Unexpectedly, though the latent heat flux of cropland will drop at a significant level, the precipitation will grow to some extent, as well as the temperature. This can be explained by that the flux and wind speed gradient will accelerate the convection and telecommunication in the study area, which will offset the negative effects of hydrometeorological anomalies. Thus, the land cover structure, which means the area and continuity of each land cover type, will also rouse uncertainties to regional climate changes.
Anthropogenic tropical forests changes have affected and will still affect the regional and global climate. Though plenty of studies have been conducted to explore the influences of vegetation vulnerability on climate variability in Amazon using various methods such as statistical extrapolation and numerical simulation models, no debate of reasonable future tropical forest land changes will be complete without taking the Brazilian Amazonia forests as a key component into account in climate researches with high resolution.
In this paper, the WRF model is used to model the effects of future tropical deforestation on regional climate between 2090 and 2100 in Brazilian Amazon. High resolution land surface map with USGS land use and land cover classification, projected from the respectable land surface product that is generated under the state-of-the-art RCP scenarios, is also utilized in this model. Land surface changes are quite different from previous studies. Forests are mainly converted into pasture and woodland, distributed along the edge of the study area and river branches. The simulated climatic results caused by these potential future land surface changes show that expanding deforestation will principally trigger the reduction of precipitation and increase of surface temperature in the deforested area. The sum of sensible heat flux and latent heat flux tends to show a decline at the same period.
However, only the impacts of deforestation on climate are evaluated in this study. In fact, various intangible factors will impose a synthetic effect on regional and global biogeophysical and biogeochemical processes which will influence the hydrological cycle and energy budget, and further result in the climate changes. Thus, the sensitivity analysis on other factors should be required in further studies.
This research was financially supported by the National Key Programme for Developing Basic Science in China (Grant no. 2010CB950900 and Grant no. 2012CB955700). Model development and data support from the Key Project funded by the Chinese Academy of Sciences (no. KZZD-EW-08) and China National Natural Science Funds for Distinguished Young Scholar (Grant no. 71225005) are also appreciated.
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