藏高原大气可降水量的时空变化.PDFVIP

中国科学院地理科学与资源研究所 青藏高原大气可降水量的 时空变化 吕 宁 资源与环境信息系统国家重点实验室 2014年11月5 日 Outline •  1. On the use of GPS measurements for Moderate Resolution Imaging Spectrometer precipitable water vapor evaluation over Tibet •  2. Trends and variability in atmospheric precipitable water over the Tibetan Plateau for 2000–2010 with different trend estimation methods •  3.Detecting long-term trend in precipitable water over the Tibetan Plateau by synthesis of station and MODIS observations 大气可降水量PW验证 青藏高原验证MODIS近红外水汽产品 Lu N. et al., 2011, JGR JICA Project, 22 GPS receivers Surface air temperature and pressure data are measured simultaneously at each GPS location. ZTD: sum of zenith hydrostatic delay and zenith wet delay; the GPS phase observations ZHD: using the local surface pressure ZWD: ZTD - ZHD January–October 2008 NCAR/EOL data Sites in Kunming 15 km distance Water-vapor-weighted mean atmospheric temperature claimed to be better than 2 mm （42.86 and 0.84 ） 验证结果 The histograms of the correlation RMSE between the MODIS and GPS over coefficients, mean biases and root the TP is 2.1 mm (19%), with the correlation mean square errors of the comparisons coefficient higher than 0.9.The overall error of the Terra