Impact of increased water vapor on precipitation efficiency over northern Eurasia

Hengchun Ye, Eric J. Fetzer, Sun Wong, Ali Behrangi, Edward T. Olsen, Judah Cohen, Bjorn H. Lambrigtsen, Luke Chen

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

This study investigates the relationships among water vapor, precipitation efficiency, precipitation amount, and air temperature anomalies on monthly time scales over northern Eurasia for winter and summer 2003-2010. Daily precipitation and temperature records at 505 historical stations, and atmospheric total precipitable water vapor and relative humidity data from Atmospheric Infrared Sounders, are used for analysis. Results show that higher atmospheric precipitable water associated with warmer temperature directly contributes to winter precipitation amount but has little impact on winter precipitation efficiency. However, accelerated decreasing relative humidity associated with higher temperature is the primary factor in the reduction of precipitation efficiency and precipitation amount regardless of higher precipitable water in summer. This study suggests that there are evident seasonal differences in precipitation trend associated with air temperature changes over the study region. Air temperature modifies a key atmospheric water variable that directly controls precipitation for that particular season. Key Points Increasing water vapor directly contributes to winter precipitation Reduced summer precipitation is related to accelerated decreasing RH

Original languageEnglish (US)
Pages (from-to)2941-2947
Number of pages7
JournalGeophysical Research Letters
Volume41
Issue number8
DOIs
StatePublished - Apr 28 2014
Externally publishedYes

Keywords

  • High latitudes
  • atmospheric precipitable water
  • northern Eurasia
  • precipitation
  • relative humidity
  • water vapor

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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