An Update on the Oceanic Precipitation Rate and Its Zonal Distribution in Light of Advanced Observations from Space
An Update on the Oceanic Precipitation Rate and Its Zonal Distribution in Light of Advanced Observations from Space
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DOI：
10.1175/jcli-d-13-00679.1
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发表时间：
2014-06-01
影响因子：
4.9
通讯作者：
Lebsock, Matthew
中科院分区：
文献类型：
--
作者：
Behrangi, Ali;Stephens, Graeme;Lebsock, Matthew
这项研究有助于利用先进的降水测量传感器提供的补充信息估计海洋降水率的全球平均值和纬向分布，并为评估当前降水产品提供独立参考。将热带降雨测量使命任务降水雷达和CloudSat云廓线雷达的降水估计值合并，因为这两个互补的传感器产生了前所未有的灵敏度范围，可以量化从毛毛雨到最强降雨率的降雨量。在没有TRMM PR的高纬度地区，Aqua的地球观测系统高级微波扫描辐射计（AMSR-E）的降水估计补充了CloudSat CPR，以捕捉强降水率。CPR的高灵敏度允许估计降雪率，这是高纬度地区的一种重要降水类型，在当前合并的降水产品中无法直接观察到。使用CloudSat、TRMM和Aqua平台的合并降水估计值（该估计值缩写为MCTA），作者对3年（2007-09）近全球（80 ° S-80 ° N）海洋平均降水率的估计值类似于2.94毫米日（-1）。这一新的全球平均海洋降水量估计值比相应的气候预测中心（CPC）降水合并分析（CMAP）值（2.68毫米日（-1））高出约9%，比全球降水气候学项目（GPCP; 2.82毫米日（-1））高出约4%。此外，MCTA还表明，降水率的纬向分布与GPCP和CMAP中描述的有明显的差异，尤其是在南半球。
This study contributes to the estimation of the global mean and zonal distribution of oceanic precipitation rate using complementary information from advanced precipitation measuring sensors and provides an independent reference to assess current precipitation products. Precipitation estimates from the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) and CloudSat cloud profiling radar (CPR) were merged, as the two complementary sensors yield an unprecedented range of sensitivity to quantify rainfall from drizzle through the most intense rates. At higher latitudes, where TRMM PR does not exist, precipitation estimates from Aqua's Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E) complemented CloudSat CPR to capture intense precipitation rates. The high sensitivity of CPR allows estimation of snow rate, an important type of precipitation at high latitudes, not directly observed in current merged precipitation products. Using the merged precipitation estimate from the CloudSat, TRMM, and Aqua platforms (this estimate is abbreviated to MCTA), the authors' estimate for 3-yr (2007-09) near-global (80 degrees S-80 degrees N) oceanic mean precipitation rate is similar to 2.94 mm day(-1). This new estimate of mean global ocean precipitation is about 9% higher than that of the corresponding Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP) value (2.68 mm day(-1)) and about 4% higher than that of the Global Precipitation Climatology Project (GPCP; 2.82 mm day(-1)). Furthermore, MCTA suggests distinct differences in the zonal distribution of precipitation rate from that depicted in GPCP and CMAP, especially in the Southern Hemisphere.