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Atmospheric heat and moisture transport to energy- and water-limited ecosystems.
Annals of the New York Academy of Sciences ( IF 4.728 ) Pub Date : 2020-05-07 , DOI: 10.1111/nyas.14357
Dominik L Schumacher,Jessica Keune,Diego G Miralles

The land biosphere is a crucial component of the Earth system that interacts with the atmosphere in a complex manner through manifold feedback processes. These relationships are bidirectional, as climate affects our terrestrial ecosystems, which, in turn, influence climate. Great progress has been made in understanding the local interactions between the terrestrial biosphere and climate, but influences from remote regions through energy and water influxes to downwind ecosystems remain less explored. Using a Lagrangian trajectory model driven by atmospheric reanalysis data, we show how heat and moisture advection affect gross carbon production at interannual scales and in different ecoregions across the globe. For water‐limited regions, results show a detrimental effect on ecosystem productivity during periods of enhanced heat and reduced moisture advection. These periods are typically associated with winds that disproportionately come from continental source regions, as well as positive sensible heat flux and negative latent heat flux anomalies in those upwind locations. Our results underline the vulnerability of ecosystems to the occurrence of upwind climatic extremes and highlight the importance of the latter for the spatiotemporal propagation of ecosystem disturbances.

中文翻译:

大气热量和水分传输到能量和水有限的生态系统。

陆地生物圈是地球系统的重要组成部分,它通过多种反馈过程以复杂的方式与大气相互作用。这些关系是双向的,因为气候会影响我们的陆地生态系统,进而影响气候。在了解陆地生物圈与气候之间的局部相互作用方面已取得了很大进展,但是,从偏远地区通过能源和水的涌入到顺风生态系统的影响,仍然很少被探索。使用由大气再分析数据驱动的拉格朗日轨迹模型,我们显示了热量和水分对流如何影响年际规模和全球不同生态区域的总碳生产。对于缺水地区,结果表明,在热量增加和水分平流减少的时期,对生态系统生产力的有害影响。这些时期通常与不成比例地来自大陆源区的风以及在那些上风位置的正显热通量和负潜热通量异常有关。我们的结果强调了生态系统在迎风气候极端事件发生时的脆弱性,并突出了后者对于生态系统扰动的时空传播的重要性。
更新日期:2020-05-07
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