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High-resolution global atmospheric moisture connections from evaporation to precipitation
Stockholm University, Faculty of Science, Stockholm Resilience Centre. Utrecht University, the Netherlands.
Number of Authors: 32020 (English)In: Earth System Science Data, ISSN 1866-3508, E-ISSN 1866-3516, Vol. 12, no 4, p. 3177-3188Article in journal (Refereed) Published
Abstract [en]

A key Earth system process is the circulation of evaporated moisture through the atmosphere. Spatial connections between evaporation and precipitation affect the global and regional climates by redistributing water and latent heat. Through this atmospheric moisture recycling, land cover changes influence regional precipitation patterns, with potentially far-reaching effects on human livelihoods and biome distributions across the globe. However, a globally complete dataset of atmospheric moisture flows from evaporation to precipitation has been lacking so far. Here we present a dataset of global atmospheric moisture recycling on both 0.5 degrees and 1.0 degrees spatial resolution. We simulated the moisture flows between each pair of cells across all land and oceans for 2008-2017 and present their monthly climatological means. We applied the Lagrangian moisture tracking model UTrack, which is forced with ERAS reanalysis data on 25 atmospheric layers and hourly wind speeds and directions. Due to the global coverage of the simulations, a complete picture of both the upwind source areas of precipitation and downwind target areas of evaporation can be obtained. We show a number of statistics of global atmospheric moisture flows: land recycling, basin recycling, mean latitudinal and longitudinal flows, absolute latitudinal and longitudinal flows, and basin recycling for the 26 largest river basins. We find that, on average, 70 % of global land evaporation rains down over land, varying between 62 % and 74 % across the year; 51 % of global land precipitation has evaporated from land, varying between 36 % and 57 % across the year. The highest basin recycling occurs in the Amazon and Congo basins, with evaporation and precipitation recycling of 63 % and 36 % for the Amazon basin and 60 % and 47 % for the Congo basin. These statistics are examples of the potential usage of the dataset, which allows users to identify and quantify the moisture flows from and to any area on Earth, from local to global scales. The dataset is available at https://doi.org/10.1594/PANGAEA.912710 (Tuinenburg et al., 2020).

Place, publisher, year, edition, pages
2020. Vol. 12, no 4, p. 3177-3188
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-189015DOI: 10.5194/essd-12-3177-2020ISI: 000598101200001OAI: oai:DiVA.org:su-189015DiVA, id: diva2:1518030
Available from: 2021-01-15 Created: 2021-01-15 Last updated: 2025-02-07Bibliographically approved

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Staal, Arie

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