Monitoring the TOPEX Microwave Radiometer with GPS: Stability of columnar water vapor measurements
Monitoring the TOPEX Microwave Radiometer with GPS: Stability of columnar water vapor measurements
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DOI：
10.1029/98gl02757
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发表时间：
1998-10
影响因子：
5.2
通讯作者：
B. Haines;Y. Bar-Sever
中科院分区：
文献类型：
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作者：
B. Haines;Y. Bar-Sever
利用陆地全球定位系统(GPS)接收器的数据，描述了TOPEX微波辐射计(TMR)柱状水汽测量中的异常漂移。根据它们的长期使用历史和靠近开放水域的TOPEX/POSEIDON(T/P)地面轨道，我们确定了四个适合校准TMR的大地测量质量的GPS站。我们根据T/P飞越时刻的GPS和TMR数据得到的对流层垂直湿路径延迟(PDWET)的瞬时差值构建了每个站点的时间序列。集合结果跨越1992-1997年，表明PDWET的TMR测量值正在逐渐降低。我们对漂移的名义估计是−1.2±0.4 mm yr−1(一个标准误差)。考虑到这一点，全球平均海平面从T/P的估计变化率将增加同样的幅度。
Using data from terrestrial global positioning system (GPS) receivers, we describe an anomalous drift in columnar water vapor measurements from the TOPEX microwave radiometer (TMR). Based on their long‐occupation histories and proximity to open‐water TOPEX/POSEIDON (T/P) ground tracks, we identified four geodetic‐quality GPS stations that are suitable for calibrating the TMR. We constructed time series at each site based on the differences of instantaneous vertical wet tropospheric path delay (PDwet) derived independently from GPS and TMR data at T/P overflight times. The ensemble results span 1992–1997 and suggest that the TMR measurements of PDwet are gradually drifting lower. Our nominal estimate of the drift is −1.2 ± 0.4 mm yr−1 (one standard error). Accounting for this would increase the estimated rate of change in global mean sea level from T/P by the same amount.