Is the residual vertical velocity a good proxy for stratosphere‐troposphere exchange of ozone?
Is the residual vertical velocity a good proxy for stratosphere‐troposphere exchange of ozone?
复制标题
残余垂直速度是否可以很好地代表平流层-对流层臭氧交换？
DOI：
10.1002/2014gl061994
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发表时间：
2014
影响因子：
5.2
通讯作者：
M. Prather
中科院分区：
文献类型：
--
作者：
J. Hsu;M. Prather
臭氧（O3）的平流层-对流层交换（STE）是对流层O3收支的关键，反过来影响气候强迫和全球空气质量。我们比较了三种常用的诊断方法，旨在量化跨对流层顶O3通量与由两个不同的欧洲中心预测场驱动的化学传输模型。我们的参考案例计算准确的，地理上可分辨的净运输在人工示踪剂e90代表对流层顶的等值面。从平流层最低层的臭氧质量收支得出的半球通量也得到了类似的结果。然而，使用Brewer多布森剩余垂直速度作为臭氧通量的比例代理，未能捕捉年际变化。因此，平流层翻转环流的强度是全球STE的一个很好的措施的共同概念并不适用于O3。在模拟的O3通量的气候变化需要诊断直接，而不是间接通过翻转环流。
Stratosphere‐troposphere exchange (STE) of ozone (O3) is key in the budget of tropospheric O3, in turn affecting climate forcing and global air quality. We compare three commonly used diagnostics meant to quantify cross‐tropopause O3 fluxes with a Chemistry‐Transport Model driven by two distinct European Centre forecast fields. Our reference case calculates accurate, geographically resolved net transport across an isosurface in artificial tracer e90 representing the tropopause. Hemispheric fluxes derived from the ozone mass budget of the lowermost stratosphere yield similar results. Use of the Brewer‐Dobson residual vertical velocity as a scaled proxy for ozone flux, however, fails to capture the interannual variability. Thus, the common notion that the strength of stratospheric overturning circulation is a good measure for global STE does not apply to O3. Climatic variability in the modeled O3 flux needs to be diagnosed directly rather than indirectly through the overturning circulation.