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Impacts of the Two Biggest Lakes on Local Temperature and Precipitation in the Yellow River Source Region of the Tibetan Plateau
The Tibetan Plateau harbors thousands of lakes; however few studies focus on impacts of lakes on local climate in the region. To investigate and quantify impacts of the two biggest lakes (Ngoring Lake and Gyaring Lake) of the Yellow River source region in the Tibetan Plateau on local climate, two simulations (with and without the two large lakes) from May 2010 to July 2011 are performed and analyzed using the WRF-CLM model (the weather research and forecasting model coupled with the community land model). Differences between simulated results show that the WRF-CLM model could provide realistic reproduction of surface observations and has better simulation after considering lakes. Lakes mostly reduce the maximum temperature all year round and increase the minimum temperature except in March due to the large heat capacity that makes lakes absorb (release) more energy for the same temperature change compared to land. Lakes increase precipitation over the lake area and in the nearby region, mostly during 02–14 BT (Beijing Time) of July to October when the warm lake surface induces the low level horizontal convergence and updraft over lake and provides energy and vapor to benefit the development of the convection for precipitation.
An army of researchers and scientists accept the observation and the outputs from simulations showing that lakes affect local climate significantly and the effects vary spatially and temporally [1–8]. Characteristics of energy budget over the lake surface are different. For example, research study from Lake Tanganyika in East Africa illustrates the annual mean heat loss increase by 13% and 18% by latent and sensible heat fluxes, resulting from the unstable atmosphere . Contrastingly, the atmosphere during summer is usually stable for the North American Great Lakes . Temperature response to the lakes also varies. For example, the surface temperature was 4°C less over the Great Slave Lake and the Great Bear Lake in Canada as compared to land in vicinity during July , while the simulation shows that the lake temperature is usually higher than that of land in southern Finland during all seasons . Two large lakes on South-Central Baffin Island in Canada delay the seasonal cooling in fall and early winter for the interior lowlands under the influence of strong positive sensible heat fluxes . The relative warming surface of lake can produce very obvious lake effect on precipitation, particularly for the downstream area [12–14]. Lake effect can increase up to 20–40% convective precipitation, during late summer and early autumn as shown from the case of Lake Ladoga in Russia . Even the warmer lake surface may possibly lead to twofold increase in downstream winter precipitation over the Great Lakes region . On the other hand, the Great Lake leads to 10–20% decline in precipitation during summer . The above references elucidate that although the lake effect is apparent in different regions worldwide, the exact nature and gradient of the effect vary significantly.
In addition, lakes play an important role in the water cycle by providing significant surface water storage generated by precipitation, snow melting, and glacier melting [2, 17–19]. With recent global warming and scarcity of water resources, to explore lake effect on local climate is an important study towards the economic development planning for the landscape and for the societal benefit in terms of land use practices and livelihoods of communities around lake regions and related river basins.
The Tibetan Plateau harbors thousands of lakes on the highest altitude worldwide. The lake network covers nearly 44,993.3 km2 and covers about 49.4% of the total lake area in China . The Tibetan Plateau is the source of major rivers in the region including the Ganges, the Mekong, the Yangtze, and the Yellow River. The Yellow River is the second longest river of China and fifth longest river in the world. The Yellow River source region is commonly referred to as the water tower of China  and occupies 48 lakes (area more than 0.5 km2). Lakes of the Yellow River source region are among the significant component of lakes network of the Tibetan Plateau. Ngoring Lake (Figure 1) is the biggest lake in the Yellow River source region. With the spread of about 610 km2 and an average depth of roughly 17 m (maximum depth is estimated as 30 m), it ranges between its south and north (west and east) end nearly 30 km. The second largest lake in the Yellow River source region is Gyaring Lake (Figure 1) with the spread of 520 km2. Two lakes are only about 20 km apart. They located (97-98°E, 34.5–35.5°N) with an altitude more than 4,200 m in the semiarid region of the Tibetan Plateau.
Lakes spread of the Tibetan Plateau is known to influence local climate. In recent years, a few scholars have performed related research in the Tibetan Plateau with in situ observation, satellite data, and numerical simulation. The in situ observation data is scarce in the Tibetan Plateau because of its vast spread and remoteness, and in situ observation only reflects one-point information. Satellite data can provide very usefully spatial information, but it only reflects the information of transit time of satellite. Numerical simulation could provide spatial and temporal information with high resolution together and is chosen as the methodology of the study. So far, the numerical study on lake effect in the Tibetan Plateau mainly focused on its very short time effect on local climate . In addition, there was few atmospheric model coupled with a lake model applied in the region. The lake surface temperature was only set as sea surface temperature from forcing data, which could not realistically represent the variation of lake temperature and interaction between air and lake. In order to fill the existing information gap, the present study will use the WRF-CLM model (the weather research and forecasting model coupled with the community land model) with ten-layer lake scheme  to study the relatively long term lake effect on local climate in the Tibetan Plateau. However, considering the limitation that the Tibetan Plateau is an extensively huge region and the “lakes” are a relatively smaller landscape scale, it is rather challenging for current computational clusters to perform a long term high resolution simulation for the entire Tibetan Plateau region. As a prototype to define the conceptual framework for the long term study of lake effect, the two biggest lakes (Ngoring Lake and Gyaring Lake) of the Yellow River source region in the Tibetan Plateau are taken up to do the study.
2. Observation Data, Model, and Numerical Experiments
2.1. Observation Data
The Tibetan Plateau has huge area, small population, and abominable natural conditions. The observation data in the Tibetan Plateau region is very scarce. In the simulated area, there is only one weather station maintained by China Meteorological Administration, called Maduo station (98.2°E, 34.9°N) with 4,272 m altitude. Its observed daily (air temperature at 2 m height) and daily precipitation data available from China Meteorological Data Sharing Service System (http://cdc.cma.gov.cn/home.do) are employed to validate the model outcome during the temporal slice from July 1, 2010, to July 31, 2011.
To study lake effect on local climate in the Tibetan Plateau, we built 3 automatic meteorological stations at the border (97.57°E, 34.92°N) of Ngoring Lake, over grassland (97.65°E, 35.03°N) close to Ngoring Lake and in an island (97.65°E, 35.02°N) in Ngoring Lake, respectively. These stations are referred to as Border, Grassland, and Island station in the following, respectively (Figure 1). At Border station, is collected since October 17, 2010, and used until the end of July in 2011. At Grassland and Island station, is also collected, but only in July 2010. LSST (The lake surface skin temperature) is also sampled from 12 to 27 of July 2010 at Island station.
2.2. Model and Numerical Experiments
The widely used and advanced regional atmospheric model, the WRF-CLM model, is employed to study the interaction between the atmosphere and the lake surface . In the model, lake processes and lake-atmosphere interactions are dynamically simulated using a 1D mass and energy balance lake scheme with 10 lake water layers . The calculation of surface fluxes of lake is close to that of nonvegetated surfaces, which is used to calculate LSST. The calculation of each layer lake temperature is depending on the Crank-Nicholson thermal diffusion solution .
The domain of simulation is centered at (97.5°E, 34.8°N) with 5 km horizontal grid spacing (Table 1). The horizontal dimension is 60 × 60. The vertical atmospheric layers are set to 31. The vertical soil and lake layers are set to 10. The lake depth is set as 17 m (a rough average depth of Ngoring Lake). The lake area can occupy 48 grids. The initial and the lateral boundary conditions are provided by the reanalyzed data Version II available from DOE/NCEP (the Department of Energy/National Centers for Environmental Prediction), where the lateral boundary data is updated every 6 hours . The simulation with every 6-hour output is performed from May 2, 2010, up to July 31, 2011. The first 2-month simulation is discarded as spin-up. The selected physical options (Table 2) included Morrison double-moment scheme , Dudhia scheme , Kain-Fritsch scheme , rapid radiative transfer model (RRTM) scheme , CLM3.5 , and Yonsei University (YSU) scheme .
The aforementioned numerical experiment is called S-lake (simulation with lake). In order to investigate and quantify the lake effect on local climate, another numerical experiment, S-nolake (simulation without lake), is performed for comparison with S-lake. S-nolake is based on S-lake, but the two big lakes (Ngoring Lake and Gyaring Lake) are filled with nearby land use cover (barren or sparsely vegetated), while the small lakes in the study area remain as such.
3.1. Evaluation of the Simulations
Simulated results in S-lake are evaluated against observed daily at all four stations, precipitation at Maduo station, and LSST at Island station. Owing to the short term observation and the similar results, simulation at Island station and Grassland station is not shown in the figures and only their RMSE (root mean square error) is given in Table 3. The magnitude and variations of simulated air temperature over lake and land in S-lake experiment are comparable with observations, but with a little cold bias in winter (Figures 2(a)-2(b)). The S-lake simulation captures the main precipitation events fairly well (Figure 2(c)) and the simulated daily precipitation agrees well with observation, except the simulation overestimates five precipitation events. The WRF-CLM model reproduces seasonal variability of precipitation with reasonable efficiency. It can be stated that the precipitation is of common occurrence (with 94% of the annual precipitation events happening in this time) during May to October, while during November to March, there is virtually no precipitation.
The S-nolake simulation is similar to S-lake (figure not shown here). But all RMSE between simulated variables and observations in S-lake is not bigger than that in S-nolake (Table 3) and the S-lake has higher accuracy. In general, the WRF-CLM model can reproduce the variability of the observation well. The WRF-CLM model demonstrates relatively better simulation results over lake and its vicinity with the lake embedded compared with the experiment without lake.
3.2. Lake Effect on Local Climate
3.2.1. Lake Effect on
The simulated annual average temperature in the region is relatively low as of the high altitude (Figure 3(a)). The simulated average annual temperature over the lake is noted as −2°C, while the value of the valley region surrounding the lake was noted as −4°C. The simulated temperature in the surrounding mountain area is simulated as −6°C or even lower, and it further declines as the altitude escalates. Two broad points are derived from the simulation analysis. (1) The temperature distribution is notably influenced by the topography and the isotherm trend in the region overlaps with the terrain height contour. (2) The air temperature over lake and land shows similar seasonal and diurnal variations (Figures 2(a)-2(b)). The minimum (maximum) temperature about −17 (11)°C is simulated for January (July) and the simulated temperature is below 0°C from October to April (Figures 2(a)-2(b)).
The annual temperature difference between S-lake and S-nolake illustrates that the lakes are warmer than the land surface (Figure 4(a)). Figure 5(a) shows that the time series of monthly mean , (daily maximum ), and (daily minimum ) difference between S-lake and S-nolake experiments averaged over the box (96.7–98.4°E, 34.6–35.5°N) in Figure 4. The enclosed area is represented by 651 grid squares in the model domain (about 15,000 km2) and more than 12 times the area of Ngoring Lake and Gyaring Lake, which is represented by 48 grids in the model domain and about 1,200 km2. Lakes increase throughout the year (Figure 5(a)), except March, while the lakes have no warm effects on during the year. Averagely, the lake is warmer from June to January of next year (Figure 5(a)) and is acting as heat source, whilst it is cool from February to May. The growing season of native plants is from May to September. And the study area is fairly cold because of high altitude. The lake warming effect will benefit vegetation growth and ecosystem stability of the Tibetan Plateau region.
3.2.2. Lake Effect on Precipitation
Together with temperature, precipitation is influenced by the topography of the region (Figure 3(b)). The higher the elevation is, the higher the precipitation is. The gradient of the simulated precipitation fluctuates from less than 300 mm to more than 900 mm in correspondence to the lake area and its surrounding mountain area. The lake area has the least precipitation. 94% precipitation occurs from May to October, while winter precipitation is negligible (Figure 2(c)). The simulated precipitation events occur at the same time in S-lake and S-nolake experiments as observed from Maduo station. The precipitation is dominated by large scale circulation, while the lake alters its magnitude.
Annually, the lakes can increase up to 49% precipitation over lakes and their nearby area (Figure 4(b)). The influenced area with more than 10% increased annual precipitation occupies 158 grids (about 3,875 km2) over the lakes and their surroundings, more than 3 times the 48 lake grids. Most previous studies on such phenomenon have proven that the precipitation induced by lakes is of local significance and limited to the lake surface or closer to their surroundings [2, 16, 28].
Figure 5(b) shows the monthly lake effect precipitation averaged over the box in Figure 4. The lake effect increases precipitation except the cold period when the time slice is not the rainfall season and has an overall very low to almost negligible precipitation (Figure 2(c)). Increased precipitation by Ngoring Lake and Gyaring Lake in spring and early summer is different with the study in the Great Lakes that leads to 10–20% decline in precipitation during summer . The increase may be attributed to the high altitude, cold environment, and the high absorption of high solar radiation by the two lakes; thus the lake in the Tibetan Plateau easily maintains warm early (Figure 6(a)). The precipitation is significantly increased from July to October with the max in August. The increase in late summer and early autumn is similar to the boreal lakes in which Lake Ladoga in Russia could increase up to 20–40% convective precipitation . Owing to the high altitude of the study area, lakes keep freezing with no rain in winter when the precipitation has no evident change. This is also different from the winter study in the Great Lake that is unfrozen and induces big lake effect precipitation in winter [29, 34].
86% increased annual precipitation by lake effect happens from July to October which is mainly focused on hereafter. From July to October, Ngoring Lake and Gyaring Lake result in significant precipitation rise over lakes and the adjacent area (Figure 6). The increase can be up to 72%, with most area recording 10–180 mm precipitation rise. The area with 20% increase in precipitation is nearly 151 grids (about 3,775 km2) amounting to 3 times the lake area.
Increased precipitation mainly consisted of convective precipitation from July to October (Figure 7). During the period, 55%, 32%, and 16% of increased precipitation happen from 02–08 BT (Beijing Time), from 08–14 BT, and from 20–02 BT, respectively. From 14–20 BT, lakes reduce 3% precipitation.
Increased precipitation generally corresponds to warmer LSST in S-lake (Figure 8) from July to October, especially from 02–14 BT. Owing to the big heat capacity of the water, lake is warmer than the land at nighttime and in the morning. Lake warming effect at 08 BT averaged from July to October can reach to 2°C (Figure 9(a)) and can influence the lake area and the downwind land area about 514 grids in the model domain (with more than 0.05°C difference in the two simulations), much bigger than 48 lake grids.
Dynamically, the lake warming effect at night and in the morning induces breeze of the order of 1 m/s from land to lake (Figure 9(a)). The low level horizontal convergence triggers the updraft to 540 hPa (Figure 9(b)). Correspondingly, the high level divergent flow appears over the lake area and downdraft appears at the two sides of the updraft. Thus the secondary circulation forms and the low level energy and moisture are transported to the high level.
Thermally, lakes release more latent heat flux (Figure 9(a)) and evaporate more vapor to benefit the development of the convection for precipitation. The warm lake surface increases the instability of atmospheric profile (Figure 9(c)) and induces more precipitation in S-lake.
4. Discussion and Conclusions
In this study, impacts of Ngoring Lake and Gyaring Lake on local climate in the Yellow River source region in the Tibetan Plateau are investigated and qualified with the aid of the newly coupled WRF-CLM model that includes 10-layer lake scheme. For this purpose, two simulations are carried out with lake and without lake. The results show that WRF-CLM has good simulation capacity for both land and lake surface in the Yellow River source region and has better accuracy when including lakes.
Although the lakes freeze from November to April (half year), overall warm lake effect is noticed. The lakes mostly reduce the maximum temperature all year round and increase the minimum temperature except in March. On a broad note, this phenomenon looks promising for proliferation of vegetation in the cold Tibetan Plateau.
In the study area, 94% precipitation occurs from May to October and winter precipitation is negligible. Lakes increase up to 49% annual precipitation over the lake area and in the nearby region. The increase in precipitation as a result of lake effect is another contributing factor to support vegetation growth in the examined region. In addition to the impact on vegetation spread, the access water from increased precipitation and vegetation is projected to contribute for the irrigation requirement in the downstream area of the rivers originating from the Tibetan Plateau. Timely, lake effect always increases monthly precipitation except the cold period when the time slice is not the rainfall season and the precipitation is very small. 86% increased precipitation by lake effect happens from July to October. During the period, Ngoring Lake and Gyaring Lake result in up to 72% precipitation rise over lakes and the adjacent area. Increased precipitation mainly consisted of convective precipitation. 87% increased precipitation falls from 02–14 BT and corresponds well with the warm lake surface temperature that increases the precipitation by thermal and dynamic forcing together. The warm lake surface induces the low level horizontal convergence and updraft over lake and provides energy and vapor to benefit the development of the convection for precipitation.
Although the lake effect on local climate has been investigated in the study, there are some limitations. (1) The study period is only one year and will be extended with the collection of longer time observation in future. (2) The analysis does not consider inundated areas and other wetland areas that are also present in the Tibetan Plateau during the rainy season and are predicted to have significant influence on the local climate as speculated from the wetland effect on Nile hydroclimatology. That will be considered in the model with the help of satellite data. (3) The other postulation is fixing of the lake depth as 17 m, as in actual scenario the lake has an uneven depth. In future the gridded lake depth will be measured with a depth finder and put into the model for more actual numerical simulation.
Conflict of Interests
The authors declare that there is no conflict of interests regarding the publication of this paper.
The study was supported by the National Natural Science Foundation of China (41475011, 41130961, and 41275014) and APEC Climate Center. The authors acknowledge the support for using the computing resources at Supercomputing Center of Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences.
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