Interdecadal Variability of Summer Precipitation Efficiency in East Asia

Wang, Jian; Gui, Shu; Ma, Anqi; Yang, Ruowen; Zhang, Qi

doi:10.1155/2019/3563024

Cited by 9 publications

(6 citation statements)

References 87 publications

(116 reference statements)

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“…Interesting to note, the ratio of precipitation delivered to the NWC from the STP (9.5%) and SEC (8.2%) is higher than that of water vapor (4.7% and 4.4%), while the ratio of precipitation from the NA (11.2%) and EUP (11.5%) is lower than that of water vapor (19.2% and 16.6%). Based on investigating the precipitation conversion e ciency in these regions, which is de ned as: 1 where is precipitation conversion e ciency, is surface precipitation (mm), and is the mass of water vapor in a column of air 29,30 (kg m − 2 ), we found that the precipitation conversion e ciency of the STP and SEC (southwestern air ow transport; 19.1% and 17.6%) is higher than that of the EUP and NA (northwestern air ow transport; 6.4% and 5.5%). By examining the spatial distribution of precipitation contributions from different sources to the NWC (as shown in Fig.…”

Section: Moisture Sourcesmentioning

confidence: 99%

Quantitating the Summer Moisture Sources over Northwest China and Its Annual Variations in Dry and Wet years

Zhu,

Qian,

Zhu

et al. 2024

Preprint

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The Northwest China (NWC) is located in an arid and semi-arid inland region, making its ecosystem highly vulnerable to changes of precipitation. Previous studies have revealed the wetting trend and potential moisture sources of the NWC, while not clearly quantified the moisture (water vapor and precipitation) sources and its interannual variability. Here, by performing and analyzing CAM5.1 simulation for 40 years, with a coupled atmospheric water tracer (AWT) algorithm, we find that the dominant sources of summer moisture over NWC are from terrestrial sources (82% of vapor and 77% of precipitation), i.e. from the North Asia (NA), Europe (EUP), southern Tibetan Plateau (STP), and southeastern China (SEC), rather than the oceanic sources. Due to the influence of synoptic patterns, the precipitation-conversion efficiency of water vapor from the southwestern airflow (STP and SEC) is higher than that from the northwestern airflow (NA and EUP). We also find that despite a general increasing trend in humidification, the fluctuation from relatively dry to wet years still persists in the NWC mainly influenced by the increased transport of moisture from terrestrial sources (NA and STP).

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Section: Moisture Sourcesmentioning

confidence: 99%

Quantitating the Summer Moisture Sources over Northwest China and Its Annual Variations in Dry and Wet years

Zhu,

Qian,

Zhu

et al. 2024

Preprint

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“…Especially in China, which is under the control of the East Asian summer monsoon, flood season disaster events are often prone to occur in summer. Considering that ENSO also has an impact on precipitation in Eurasia [59][60][61][62], this study compares the relationship between summertime AO and East Asian precipitation for different sub-periods, with the influence of ENSO excluded (Figure 2). Considering that precipitation is influenced by multiple factors and is complex, previous studies on precipitation (e.g., [44,61,63,64]) have used a confidence level of 80% to 90%.…”

Section: Impacts Of Ao On Precipitation In East Asiamentioning

confidence: 99%

The Impacts of Regime Shift in Summer Arctic Oscillation on Precipitation in East Asia

Zou,

Yan,

et al. 2024

Atmosphere

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Using multiple observational and reanalysis data, this paper investigates the impact of the interdecadal shift in summer Arctic Oscillation (AO) on precipitation in East Asia, by removing ENSO influences. The results indicate that the lower-layer activity center of summer AO in Atlantic shifted eastward after the mid-1980s. This regime shift of summer AO has a significant impact on precipitation in East Asia. Before the mid-1980s, the key regions in which precipitation was affected by AO in East Asia were northern East Asia and Northeastern China and adjacent regions. After the mid-1980s, the key regions in which precipitation was affected by AO in East Asia were central Inner Mongolia and Southern China. The mechanism of precipitation changes can be attributed to changes in atmospheric circulation and water vapor transport related to AO changes. After the mid-1980s, the influence of AO on geopotential height over northern East Asia weakened; meanwhile, the impact of AO on geopotential height over China increased. Consistent with the changes in atmospheric circulation, water vapor transport in East Asia also underwent interdecadal changes before and after the mid-1980s. The differences in atmospheric circulation and water vapor transport in East Asia can be traced back to the North Atlantic. Before the mid-1980s, wave activity flux related to summer AO tended to propagate in high latitudes and subtropics; after the mid-1980s, the wave activity flux changed in its subtropical path and propagated eastward from the North Atlantic through the Middle East to China, significantly affecting the summer precipitation in China.

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“…Extreme rainfall in SWC has obvious interannual and interdecadal variability, and its spatial distribution is uneven. Long‐term climate change, human influence, and geographical factors have had a huge impact on it (Liu et al ., 2015; Mu et al ., 2017; Wang et al ., 2019). In recent decades, human activities have aggravated soil erosion and rocky desertification in SWC, making more frequent natural hazards caused by extreme rainfall (Gao and Sang, 2017; Wei et al ., 2018).…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical synchronization of extreme rainfall events in southwest China

Qiao

Gong

Liu

et al. 2022

Intl Journal of Climatology

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Based on the complex network method, this study reveals the temporal and spatial characteristics of the synchronization of extreme rainfall events in southwest China (SWC) during the main rainfall season (May–September). Our results show the significant synchronization pattern of extreme rainfall events in SWC, which is closely associated with the convergence of warm‐wet air and cold‐dry air and the corresponding occurrence of extreme rainfall in SWC. The network divergence indicates a dominated direction of the net influence of extreme rainfall from the Sichuan Basin to the Yunnan–Guizhou Plateau, implying the extreme rainfall synchronization moving from north to south in SWC is more frequent than the opposite direction. The development of the low vortex and the north wind system usually shows a movement from north to south, resulting in the evolution of extreme rainfall events more tend to present a southward movement. The low‐reinforced latitude cyclonic circulation leads to the strengthened transportation of water vapour from the tropical area to the north and converges with the anticyclonic circulation in the mid‐latitudes to form the movement of heavy rainfall events from the Yunnan–Guizhou Plateau to the Sichuan Basin. Therefore, the synchronization direction of extreme rainfall events in SWC has obvious asymmetry spatial feature due to the more frequent and stronger circulation system moving from north to south than the opposite.

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Interdecadal Variability of Summer Precipitation Efficiency in East Asia

Cited by 9 publications

References 87 publications

Quantitating the Summer Moisture Sources over Northwest China and Its Annual Variations in Dry and Wet years

Quantitating the Summer Moisture Sources over Northwest China and Its Annual Variations in Dry and Wet years

The Impacts of Regime Shift in Summer Arctic Oscillation on Precipitation in East Asia

Asymmetrical synchronization of extreme rainfall events in southwest China

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