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Title: Investigating land surface effects on the moisture transport over South America with a moisture tagging model

Abstract

Land-atmosphere interactions are a critical component of precipitation processes within the Amazon and the La Plata river basins (LPRB) in South America. The possible pathways through which the land surface can affect precipitation are: 1) by changing the amount of moisture available for precipitation (moisture recycling) and 2) by changing the atmospheric thermal structure and consequently affecting circulation patterns. In this study, the Weather Research and Forecasting (WRF) model with embedded water vapor tracers (WVT) is used to disentangle these relative contributions. Using WRF-WVT we track the moisture that originates from the Amazon basin over a 10-year period. It is estimated that Amazon evapotranspiration (ET) contributes to around 30% of the total precipitation over the Amazon and around 20% over the LPRB. Analyzing moisture transport from the Amazon to the LPRB, it is found that warm (cool) surface air temperature over the northwestern Argentine is linked to low level winds and likely to induce northerly (southerly) winds that intensify (weaken) moisture transport by changing continental-scale circulation patterns.

Authors:
 [1];  [2]
  1. BATTELLE (PACIFIC NW LAB)
  2. University of Illinois at Urbana-Champaign
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1572660
Report Number(s):
PNNL-SA-141786
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Climate
Additional Journal Information:
Journal Volume: 32; Journal Issue: 19
Country of Publication:
United States
Language:
English

Citation Formats

Yang, Zhao, and Dominguez, Francina. Investigating land surface effects on the moisture transport over South America with a moisture tagging model. United States: N. p., 2019. Web. doi:10.1175/JCLI-D-18-0700.1.
Yang, Zhao, & Dominguez, Francina. Investigating land surface effects on the moisture transport over South America with a moisture tagging model. United States. doi:10.1175/JCLI-D-18-0700.1.
Yang, Zhao, and Dominguez, Francina. Tue . "Investigating land surface effects on the moisture transport over South America with a moisture tagging model". United States. doi:10.1175/JCLI-D-18-0700.1.
@article{osti_1572660,
title = {Investigating land surface effects on the moisture transport over South America with a moisture tagging model},
author = {Yang, Zhao and Dominguez, Francina},
abstractNote = {Land-atmosphere interactions are a critical component of precipitation processes within the Amazon and the La Plata river basins (LPRB) in South America. The possible pathways through which the land surface can affect precipitation are: 1) by changing the amount of moisture available for precipitation (moisture recycling) and 2) by changing the atmospheric thermal structure and consequently affecting circulation patterns. In this study, the Weather Research and Forecasting (WRF) model with embedded water vapor tracers (WVT) is used to disentangle these relative contributions. Using WRF-WVT we track the moisture that originates from the Amazon basin over a 10-year period. It is estimated that Amazon evapotranspiration (ET) contributes to around 30% of the total precipitation over the Amazon and around 20% over the LPRB. Analyzing moisture transport from the Amazon to the LPRB, it is found that warm (cool) surface air temperature over the northwestern Argentine is linked to low level winds and likely to induce northerly (southerly) winds that intensify (weaken) moisture transport by changing continental-scale circulation patterns.},
doi = {10.1175/JCLI-D-18-0700.1},
journal = {Journal of Climate},
number = 19,
volume = 32,
place = {United States},
year = {2019},
month = {10}
}