Long- and short-term changes in sulfate deposition: Effects of the 1990 Clean Air Act Amendments

被引：65

作者：

Likens, GE ^{[1
]}

Butler, TJ ^{[1
]}

Buso, DC ^{[1
]}

机构：

[1] Inst Ecosyst Studies, Millbrook, NY 12545 USA

来源：

BIOGEOCHEMISTRY | 2001年 / 52卷 / 01期

基金：

美国国家科学基金会; 美国安德鲁·梅隆基金会;

关键词：

dry deposition; Hubbard Brook; long-term data; precipitation chemistry; SO2; emissions; sulfate;

D O I：

10.1023/A:1026563400336

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Annual, volume-weighted concentrations of SO42- in bulk precipitation have declined steadily (-0.44 mu mol/liter-yr) since 1965 at the Hubbard Brook Experimental Forest (HBEF), NH in response to decreases in regional SO2 emissions (r(2) = 0.74). Similar declines in concentrations have occurred in wet-only precipitation at HBEF and at nearby sites since 1978. However, decreases in SO42- concentrations following passage of the U.S. Clean Air Act Amendments in 1990, were not unusual from the perspective of long-term data from the HBEF. Statistically significant declines (-5.6 mol/ha-yr) in bulk deposition of SO42- also have occurred since 1965 in relation to decreases in SO2 emissions (r(2) = 0.58), but annual variations in deposition also are strongly related to amount of precipitation and other factors.

引用

页码：1 / 11

页数：11

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