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- W2099161036 abstract "Abstract The oxidizing capacity of the troposphere is controlled primarily by the abundance of hydroxyl radical (OH). The global mean concentration of tropospheric OH, [OH] TROP (the burden of OH in the global troposphere appropriate for calculating the lifetime of methane) inferred from measurements of methyl chloroform has remained relatively constant during the past several decades despite rising levels of methane that should have led to a decline. Here we examine other factors that may have affected [OH] TROP such as the changing values of stratospheric ozone, rising tropospheric H 2 O, varying burden of NO x (=NO+NO 2 ), rising temperatures, and widening of the climatological tropics due to expansion of the Hadley cell. Our analysis suggests the positive trends in [OH] TROP due to H 2 O, NO x , and overhead O 3 , and tropical expansion are large enough (Δ [OH] TROP = +0.95 ± 0.18%/decade) to counter almost all of the expected decrease in [OH] TROP due to rising methane (Δ [OH] TROP = −1.01 ± 0.05%/decade) over the period 1980 to 2015, while variations in temperature contribute almost no trend (Δ [OH] TROP = −0.02 ± 0.02%/decade) in [OH] TROP . The approximated impact of Hadley cell expansion on [OH] TROP is also a small but not insignificant factor partially responsible for the steadiness of tropospheric oxidizing capacity over the past several decades, which free‐running models likely do not capture." @default.
- W2099161036 created "2016-06-24" @default.
- W2099161036 creator A5021264271 @default.
- W2099161036 creator A5024506143 @default.
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- W2099161036 creator A5067928766 @default.
- W2099161036 creator A5071648122 @default.
- W2099161036 creator A5077193159 @default.
- W2099161036 creator A5090607923 @default.
- W2099161036 date "2018-09-26" @default.
- W2099161036 modified "2023-10-14" @default.
- W2099161036 title "Changes in Global Tropospheric OH Expected as a Result of Climate Change Over the Last Several Decades" @default.
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