Low‐Level Jets Over the Bohai Sea and Yellow Sea: Climatology, Variability, and the Relationship With Regional Atmospheric Circulations

Li, Delei; Storch, Hans von; Yin, Baoshu; Xu, Zhenhua; Qi, Jia; Wei, Wei; Guo, Dali

doi:10.1029/2017jd027949

Cited by 16 publications

(18 citation statements)

References 60 publications

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“…By contrast, the proportion of wind from other directions is far smaller than that from the southwest. This consequence is similar to the 35‐year regional climate model analysis in Bohai Sea (Li et al, ). It should be noted that in our analysis, days with background winds from nonsouthwesterly directions are filtered out to avoid confusion among different wind directions.…”

Section: Characteristics Of Clljssupporting

confidence: 87%

Characteristics of Coastal Low‐Level Jets in the Bohai Sea, China, During the Early Warm Season

Zhang

et al. 2018

JGR Atmospheres

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We investigate coastal low‐level jets (CLLJs) in the early warm season during 2006–2011 over the Bohai Sea using a 9‐km horizontal resolution output data from the Weather Research and Forecasting model. CLLJs mainly occur in May when large‐scale low is located over land to the north and the Pacific high is located to the southeast of the study area. The occurrence of the CLLJs exhibits an obvious diurnal cycle with two different peaks: one at night, located mainly in the central region, and the other in the afternoon, located in the northern region with mountains at both eastern and western sides. A momentum budget analysis shows that inertial oscillations, triggered by land‐sea thermal contrast, results in the formation of nocturnal CLLJs in the Bohai Sea. In addition, sensitivity experiments show that the enhanced atmospheric baroclinicity, caused by unbalanced solar radiation over the western mountain of the northern region, dominates the occurrence of afternoon CLLJs in the northern area of the Bohai Sea. Besides that, the eastern topography plays a main role as barrier and, therefore, traps CLLJs by topography blocking to its western side.

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Section: Characteristics Of Clljssupporting

confidence: 87%

Characteristics of Coastal Low‐Level Jets in the Bohai Sea, China, During the Early Warm Season

Zhang

et al. 2018

JGR Atmospheres

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“…In the EBUS regions, the feedbacks between atmosphere, land, and ocean play a crucial role in defining the respective regional climates. However, CLLJs can also be found along the southeast Arabian Peninsula (Ranjha et al, 2015) and over the Bohai Sea and Yellow Sea (D. Li et al, 2018). Along the EBUSs, the sea surface temperature (SST) decreases due to upwelling, which leads to a reduction of the evaporation over the ocean and subsequently to less water vapor content in the marine atmospheric boundary layer (MABL).…”

Section: Introductionmentioning

confidence: 99%

“…Coastal jets are usually found along the equatorward eastern boundary currents (California, Canary, Humboldt, Benguela, and West Australia), due to a large-scale synoptic forcing Ranjha et al, 2013;Winant et al, 1988). However, CLLJs can also be found along the southeast Arabian Peninsula (Ranjha et al, 2015) and over the Bohai Sea and Yellow Sea (D. Li et al, 2018). The synoptic forcing of the eastern boundary currents CLLJs is characterized by semipermanent high-pressure systems over the ocean and the thermal low over land, resulting in strong coastal parallel winds.…”

Section: Introductionmentioning

confidence: 99%

How Will a Warming Climate Affect the Benguela Coastal Low‐Level Wind Jet?

et al. 2019

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The strong coastal upwelling associated to the Benguela eastern boundary upwelling system makes the ocean along coast of this current one of the most productive ecosystems in the world. The Benguela Coastal Low‐Level Jet (BCLLJ) is one of the most important mesoscale feature that shape the climate of this region. The main synoptic forcing of the BCLLJ is the Angola thermal low over land and the St. Helen anticyclone over the ocean, resulting in southwesterly winds along the coast. This study investigates how the BCLLJ might change due to climate warming, with the help of uncoupled and coupled simulations from a 25‐km horizontal resolution regional climate model (ROM). In general, the coupled simulation displays the best performance in representing the present time near‐surface wind speed, with a decrease on the known warm bias of sea surface temperature in the Benguela eastern boundary upwelling system region. The analysis of the projected changes of the BCLLJ climate toward the end of the 21st century (2070–2099), following the RCP8.5 emissions scenario, shows an increase in the frequency of the BCLLJ occurrence along the southern area with higher changes in the coupled simulation (between 6% and 8%). These changes are related to a southerly shift of the St. Helen High, which intensifies the flow offshore the west coast of South Africa and causes a sharpening of the land‐sea thermal contrasts. However, during spring, associated with the decrease in near‐surface wind speed due to higher sea surface temperatures, the future frequency and intensity of the BCLLJ are lower.

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“…Furthermore. Li et al (2018) proved the hindcast can reproduce the climatology, the diurnal cycle, the variability of wind profiles, and specific low level jet (LLJ) cases, which are mesoscale-flow phenomena with horizontal wind maxima within the lowest few kilometers of the troposphere. Long-term statistics of LLJs reveal that they feature a strong diurnal cycle, intraannual, and interannual variability but weak decadal variability.…”

Section: Simulating Small Synoptic Features Conditioned By the Large-mentioning

confidence: 99%

“…A climatology of Polar Lows in the North Atlantic was obtained by implementing this method , and later of Polar Lows in the North Pacific (Chen and von Storch, 2013), of Medicanes in the Mediterranean Sea (Cavicchia et al, 2014a), and of Coastal Low Level Jets in the Bohai / Yellow sea region (Li et al, 2018). The methodology has matured now and is routinely used in many applications -mainly for deriving atmospheric states in the past decades.…”

Section: Introductionmentioning

confidence: 99%

State and Perspectives of the Concept of Large‐Scale Conditioning of Regional Climate Modelling

Storch¹,

Cavicchia²,

Feser³

et al. 2018

Preprint

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We review the state of dynamical downscaling with scale-constrained regional and global models. The methodology, in particular spectral nudging, has become a routine and well-researched tool for hindcasting climatologies of sub-synoptic atmospheric disturbances in coastal regions. At present, the spectrum of applications is expanding to other phenomena, but also to ocean dynamics and to extended forecasting. Also new diagnostic challenges are appearing such as spatial characteristics of small-scale phenomena such as Low Level Jets.

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Low‐Level Jets Over the Bohai Sea and Yellow Sea: Climatology, Variability, and the Relationship With Regional Atmospheric Circulations

Cited by 16 publications

References 60 publications

Characteristics of Coastal Low‐Level Jets in the Bohai Sea, China, During the Early Warm Season

Characteristics of Coastal Low‐Level Jets in the Bohai Sea, China, During the Early Warm Season

How Will a Warming Climate Affect the Benguela Coastal Low‐Level Wind Jet?

State and Perspectives of the Concept of Large‐Scale Conditioning of Regional Climate Modelling

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