When Will the Unprecedented 2022 Summer Heat Waves in Yangtze River Basin Become Normal in a Warming Climate?

Ma, Feng; Yuan, Xing

doi:10.1029/2022gl101946

Cited by 43 publications

(16 citation statements)

References 54 publications

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“…The extreme heat and drought event in the Yangtze River Basin in China in 2022 has attracted wide attention (Hua et al., 2023; X. Li et al., 2023; Ma & Yuan, 2023; J. Wang, Yan, et al., 2023). Concurrently, the TP experienced both extreme high temperatures and low PRE during the summer of 2022, reaching levels unprecedented since 2000.…”

Section: Discussionmentioning

confidence: 99%

Warm Early Summer Compensated Reduction in Photosynthesis Caused by 2022 Late Summer Extreme Drought Over the Tibetan Plateau

Yan,

Wang,

Wang

et al. 2024

JGR Biogeosciences

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The Tibetan Plateau (TP) is ecologically delicate, its vegetation highly sensitive to climate variations. In 2022, China endured an unprecedented compound drought‐heatwave, escalating TP's August temperature to a record high since 2000. This study examined this event's impact on TP's photosynthesis using multi‐source satellite‐based products. We demonstrated persistent high temperatures from April to August 2022, accompanied by shifting soil water (SW). Initially moist from April to June, the soil turned notably dry, hitting its lowest point in August. Consequently, early summer witnessed a substantial enhancement in gross primary productivity (GPP) and near‐infrared reflectance of vegetation (NIRv) predominantly due to high temperatures, except for reduction in the eastern and southeastern TP. June recorded the largest positive GPP anomaly since 2000. As summer progressed, severe drought, not high temperatures, dominated, causing obvious negative anomalies in GPP and NIRv, especially in August, concentrated in the central and southwestern TP. Separating the growing season into May–June–July (MJJ) and August–September (AS) revealed a clear contrast. Enhancement in photosynthesis during MJJ compensated the decline in AS, making average positive GPP and weak negative NIRv anomalies in the entire growing season. Specifically, MJJ saw GPP magnitudes of 5.724 TgC mo−1 in FluxSat, 9.491 TgC mo−1 in GPP v2.2 and OCO‐2‐based Solar‐induced chlorophyll fluorescence (GOSIF), and 0.004 in NIRv. Conversely, AS experienced a decline: −4.802 TgC mo−1 in FluxSat, −2.837 TgC mo−1 in GOSIF GPP, and −0.006 in NIRv. This delicate balance underscores the intricate interplay between early growth conditions, subsequent environmental stressors, and vegetation's adaptive responses.

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Section: Discussionmentioning

confidence: 99%

Warm Early Summer Compensated Reduction in Photosynthesis Caused by 2022 Late Summer Extreme Drought Over the Tibetan Plateau

Yan,

Wang,

Wang

et al. 2024

JGR Biogeosciences

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“…In the summer of 2022, simultaneous drought and heatwave emerged in many regions of China, especially the Yangtze River Basin (YZB). In July and August, the YZB witnessed the strongest heatwave with the highest average temperature and number of high temperature days (maximum temperature >35 • C) since meteorological observations were available in 1961 (Jiang et al 2023, Ma and Yuan 2023, Wang et al 2023b. Approximately 360 million people experienced temperatures exceeding 40 • C at some point during this summer in China (Mallapaty 2022).…”

Section: Introductionmentioning

confidence: 99%

Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China

Ni,

Qiu,

Miao

et al. 2024

Environ. Res. Lett.

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Compound hot-dry events (CHDEs) are among the deadliest climate hazards and are occurring with increasing frequency under global warming. The Yangtze River Basin in China experienced a record-breaking CHDE in the summer of 2022, causing severe damage to human societies and ecosystems. Recent studies have emphasized the role of atmospheric circulation anomalies in driving this event. However, the contribution of land–atmosphere feedback to the development of this event remains unclear. Here, we investigated the impacts of soil moisture-temperature coupling on the development of this concurrent heatwave and drought. We showed that large amounts of surface net radiation were partitioned to sensible heat instead of latent heat as the soil moisture-temperature coupling pattern shifted from energy-limited to water-limited under low soil moisture conditions, forming positive land–atmosphere feedback and leading to unprecedented hot extremes in August. The spatial heterogeneity of hot extremes was also largely modulated by the land–atmosphere coupling strength. Furthermore, enhanced land–atmosphere feedback has played an important role in intensifying CHDEs in this traditional humid region. This study improves the understanding of the development of CHDEs from three aspects, including timing, intensity, and spatial distribution, and enables more effective early warning of CHDEs.

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“…Moreover, in 2022, the deaths of more than 15,000 people in Europe were associated with unusual heat extremes, and the temperature in the United Kingdom exceeded 40°C for the first time (WMO, 2023). In 2022, long‐lasting heat extremes in China since records began in 1961 were exceeded for 79 days, where over 5 million km 2 were affected (Jiang et al., 2023; Liu et al., 2023; Ma & Yuan, 2023; WMO, 2023).…”

Section: Introductionmentioning

confidence: 99%

Increased Population Exposure to Heat and Wet Extremes Moving From Chinese to Global 1.5 or 2.0°C Warming

Qin,

Xie

2023

JGR Atmospheres

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The Paris Agreement proposed two global warming levels relative to the preindustrial period, with the ideal objective of 1.5°C warming and an upper boundary of 2.0 °C. However, the years when the temperature will first reach 1.5 or 2.0°C vary in different regions. Therefore, climate extremes and their population exposure are still not clear at regional or global warming levels. This study investigated climate extremes in China at different Chinese and global warming with 16 CMIP6 models under the middle SSP245 scenario. In China, the year when 1.5°C warming is projected to occur is 2020 and 2035 for 2.0°C warming. These values are more than 10 years earlier than the corresponding global warming levels of 2030 and 2049. Population exposure to percentile‐based heat extremes at global 1.5°C warming is projected to greatly increase relative to those when 1.5°C warming occurs in China due to increases in climate extremes, and exposure to absolute heat extreme indices is projected to decrease from Chinese to global 2.0°C warming under the joint impacts of increases in extremes and population decreases. Furthermore, from Chinese to global 1.5°C warming, about 344 million people will experience increased exposure to heat, wet and dry extremes, and around 468 and 371 million people will be affected by increased exposure to heat–wet and heat–dry extremes, respectively. Thus, a more adaptive strategy should be proposed to cope with the future possible natural hazards caused by heat–wet and heat–dry extremes.

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When Will the Unprecedented 2022 Summer Heat Waves in Yangtze River Basin Become Normal in a Warming Climate?

Cited by 43 publications

References 54 publications

Warm Early Summer Compensated Reduction in Photosynthesis Caused by 2022 Late Summer Extreme Drought Over the Tibetan Plateau

Warm Early Summer Compensated Reduction in Photosynthesis Caused by 2022 Late Summer Extreme Drought Over the Tibetan Plateau

Shift of soil moisture-temperature coupling exacerbated 2022 compound hot-dry event in eastern China

Increased Population Exposure to Heat and Wet Extremes Moving From Chinese to Global 1.5 or 2.0°C Warming

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