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Effects of climate-induced changes in isoprene emissions after the eruption of Mount Pinatubo

机译：皮纳图博火山喷发后气候引起的异戊二烯排放量变化的影响

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摘要

In the 1990s the rates of increase of greenhouse gas concentrations, most notably of methane, were observed to change, for reasons that have yet to be fully determined. This period included the eruption of Mt. Pinatubo and an El Ni?o warm event, both of which affect biogeochemical processes, by changes in temperature, precipitation and radiation. We examine the impact of these changes in climate on global isoprene emissions and the effect these climate dependent emissions have on the hydroxy radical, OH, the dominant sink for methane. We model a reduction of isoprene emissions in the early 1990s, with a maximum decrease of 40 Tg(C)/yr in late 1992 and early 1993, a change of 9%. This reduction is caused by the cooler, drier conditions following the eruption of Mt. Pinatubo. Isoprene emissions are reduced both directly, by changes in temperature and a soil moisture dependent suppression factor, and indirectly, through reductions in the total biomass. The reduction in isoprene emissions causes increases of tropospheric OH which lead to an increased sink for methane of up to 5 Tg(CH_4)/year, comparable to estimated source changes over the time period studied. There remain many uncertainties in the emission and oxidation of isoprene which may affect the exact size of this effect, but its magnitude is large enough that it should remain important.
机译：在1990年代，由于尚未完全确定的原因，人们观察到温室气体（尤其是甲烷）浓度的增加速率发生了变化。这个时期包括山的喷发。皮纳图博（Pinatubo）和厄尔尼诺现象（El Ni？o）暖事件，两者都会通过温度，降水和辐射的变化影响生物地球化学过程。我们研究了这些气候变化对全球异戊二烯排放的影响，以及这些与气候有关的排放对羟基自由基OH（甲烷的主要汇）的影响。我们以1990年代初的异戊二烯排放量减少为模型，在1992年末和1993年初，最大减少量为40 Tg（C）/年，变化幅度为9％。这种降低是由Mt喷发后的凉爽，干燥条件引起的。皮纳图博。异戊二烯的排放既可以通过温度变化和土壤湿度依赖性抑制因子直接降低，也可以通过减少总生物量间接降低。异戊二烯排放量的减少会导致对流层OH的增加，从而导致甲烷汇的增加高达5 Tg（CH_4）/年，这与研究期间估算的源变化相当。异戊二烯的排放和氧化仍然存在许多不确定因素，可能会影响这一效应的确切大小，但其大小足够大，因此仍很重要。

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