ATMOSPHERIC WATER-BALANCE IN THE AMAZON BASIN - AN ISOTOPIC EVAPOTRANSPIRATION MODEL

被引：312

作者：

GAT, JR

MATSUI, E

机构：

[1] UNIV SAO PAULO, CTR ENERGIA NUCL AGR, PIRACICABA, BRAZIL

[2] WEIZMANN INST SCI, DEPT ISOTOPE, IL-76100 REHOVOT, ISRAEL

[3] UNIV SAO PAULO, COMISS NACL ENERGIA NUCL, PIRACICABA, BRAZIL

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 1991年 / 96卷 / D7期

关键词：

D O I：

10.1029/91JD00054

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

An increase of 3 parts per thousand in the "d" value of the isotopic composition of precipitation over the Amazon Basin suggests that an isotopically fractionated evapotranspiration flux contributes to the atmospheric water balance over the region. A steady state evapotranspiration model for the Amazon Basin was developed, and it is shown that the observed increase in the "d" value corresponds to a situation where 20-40% of the total evapotranspiration flux is accompanied by an isotopic fractionation, such as by evaporation from an open water surface. The site of this fractionation, whether by evaporation from the flood plains, canopy interception or lakes, cannot be resolved with the presently available data set.

引用

页码：13179 / 13188

页数：10