Climatic Variation at Thumba Equatorial Rocket Launching Station, India

Table 1

Details on instrumentation, data used, and the observed variation in maximum absolute error in monthly mean used in the discussion of climatology at 0830 IST.

S. no	Parameter	Data used	Instrument	Height (agl) (cm)	Exposure	Lowest and highest maximum absolute error	Make	Maintenance and calibration protocol
1	Maximum temperature (°C)	1964–2008	Maximum thermometer (Mercury-in-glass thermometer)	122	Stevenson screen	0.087 to 0.132 (°C)	IMD	Daily, weekly, monthly, half yearly, annual, and periodic
2	Minimum temperature (°C)	1964–2008	Minimum thermometer (spirit-in-glass)	122	Stevenson screen	0.061 to 0.145 (°C)	IMD
3	Dry-bulb temperature (°C)	1964–2008	Drybulb thermometer (mercury-in-glass thermometer)	122	Stevenson screen	0.088 to 0.125 (°C)	IMD
4	Rainfall (mm)		Nonrecording rain gauge of collector area 20 square cm	0	Ground
4	Wet-bulb temperature (°C)	1964–2008	Wet-bulb thermometer	122	Stevenson screen	0.06 to 0.146 (°C)	IMD
5	Relative humidity (%)	1964–2008	Drybulb thermometer, wetbulb thermometer, and psychrometer table.	122	Stevenson screen	0.512 to 0.916 (%)	IMD
6	Soil temperature (°C)	1964–2008	Soil thermometer in metallic tube	−5		0.201 to 0.261 (°C)	IMD
7	Pressure (mb)	1974–2008	Aneroid barograph (diaphragm type)	6.70 m amsl			IMD
8	Wind speed	1964–2008	Anemometer	300		0.043 to 0.24 (m/s)	IMD/Dynalab
9	Wind direction	1964–2008	Wind vane	300		Within 1 degree	IMD/Dynalab