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The Role of Climate and Vegetation in Regulating Drought-Heat Extremes
- Title
- The Role of Climate and Vegetation in Regulating Drought-Heat Extremes
- Authors
- O, Sungmin; Bastos, Ana; Reichstein, Markus; Li, Wantong; Denissen, Jasper; Graefen, Hanna; Orth, Rene
- Ewha Authors
- 오승민
- SCOPUS Author ID
- 오승민
- Issue Date
- 2022
- Journal Title
- JOURNAL OF CLIMATE
- ISSN
- 0894-8755
1520-0442
- Citation
- JOURNAL OF CLIMATE vol. 35, no. 17, pp. 5677 - 5685
- Keywords
- Drought; Extreme events; Atmosphere-land interaction; Hydrometeorology
- Publisher
- AMER METEOROLOGICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Droughts cause serious environmental and societal impacts, often aggravated by simultaneously occurring heat waves. Climate and vegetation play key roles in the evolution of drought-associated temperature anomalies, but their relative importance is largely unknown. Here, we present the hottest temperature anomalies during drought in subhumid and tree-dominated regions using observation-based, global data over 2001-15. These anomalies are mainly driven by a drought-related net radiation surplus and further amplified by forests' water-saving strategies that result in diminished evaporative cooling. By contrast, in semiarid and short-vegetation regions, drought-related temperature increases are smaller. The reduction of evaporative cooling is weak and net radiation increases only marginally due to high albedo over drought-stressed vegetation. Our findings highlight the importance of considering all interacting factors in understanding diverse mechanisms of concurrent drought-heat extremes across different climate regimes. Significance StatementClimate and vegetation have a strong influence in regulating temperature anomalies during drought. However, the physical mechanisms behind drought-heat events across different climate-vegetation regimes are not always accurately described in physically based models. Here we use global-scale, observation-based datasets to show the spatial variation of temperature anomalies during drought, with the largest anomalies in subhumid and tree-dominated regions. Further, we present observational evidence for the relative roles of climate and vegetation in shaping drought-heat extremes across space. Our study provides valuable inputs to better understand the drought-heat pathways and their spatial variations, which can inform drought adaptation and mitigation efforts.
- DOI
- 10.1175/JCLI-D-21-0675.1
- Appears in Collections:
- 공과대학 > 기후에너지시스템공학과 > Journal papers
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