An assessment of the diurnal variation of upper tropospheric humidity in reanalysis data sets

被引：21

作者：

Chung, Eui-Seok ^{[1
]}

Soden, Brian J. ^{[1
]}

Sohn, B. J. ^{[2
]}

Schmetz, Johannes ^{[3
]}

机构：

[1] Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Miami, FL 33149 USA

[2] Seoul Natl Univ, Sch Earth & Environm Sci, Seoul, South Korea

[3] EUMETSAT, Meteorol Div, Darmstadt, Germany

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 2013年 / 118卷 / 09期

关键词：

Diurnal variation; Upper tropospheric humidity; Reanalyses; WATER-VAPOR; RELATIVE-HUMIDITY; CONVECTION; CYCLE; SYSTEMS; CHANNEL; CLOUDS;

D O I：

10.1002/jgrd.50345

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Diurnal variations of upper tropospheric humidity (UTH) in five different reanalysis data sets are compared over convective land and ocean regions and evaluated using multiple satellite observations as a reference. All reanalysis data sets reproduce the day-night contrast of upper tropospheric humidity and the land-ocean contrast in the diurnal amplitude. The infrared satellite measurements indicate a slightly later diurnal minimum over land relative to most reanalyses and the microwave satellite measurements, suggesting that cloud masking of the infrared radiances may introduce a small (similar to 3 h) bias in the phase. One reanalysis exhibits a substantially different diurnal cycle over land which is inconsistent with both infrared and microwave satellite measurements and other reanalysis products. This product also exhibits a different covariance between vertical velocity, cloud water, and humidity than other reanalyses, suggesting that the phase bias is related to deficiencies in the parameterization of moist convective processes.

引用

页码：3425 / 3430

页数：6

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