Shift in the Temporal Trend of Boundary Layer Height in China Using Long‐Term (1979–2016) Radiosonde Data

Guo, Jianping; Li, Yuan; Cohen, Jason Blake; Li, Jian; Chen, Dandan; Xu, Hui; Liu, Lin; Yin, Jinfang; Hu, Kaixi; Zhai, Panmao

doi:10.1029/2019gl082666

Cited by 147 publications

(100 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, radiosonde‐derived BLHs have shown a trend reversal (from increasing to decreasing) in recent decades in China. This is found, however, to be correlated more with increases in soil moisture than with the aerosol trend (Guo et al, ). Therefore, the long‐term impact of ADR, especially on the PBL structure, remains inconclusive and merits further analyses by combining observations with model simulations where land‐atmosphere coupling should be considered.…”

Section: Aerosol Formation Nucleation Optical Properties and Radiamentioning

confidence: 99%

East Asian Study of Tropospheric Aerosols and their Impact on Regional Clouds, Precipitation, and Climate (EAST‐AIR_CPC)

et al. 2019

Self Cite

View full text Add to dashboard Cite

Aerosols have significant and complex impacts on regional climate in East Asia. Cloud‐aerosol‐precipitation interactions (CAPI) remain most challenging in climate studies. The quantitative understanding of CAPI requires good knowledge of aerosols, ranging from their formation, composition, transport, and their radiative, hygroscopic, and microphysical properties. A comprehensive review is presented here centered on the CAPI based chiefly, but not limited to, publications in the special section named EAST‐AIRcpc concerning (1) observations of aerosol loading and properties, (2) relationships between aerosols and meteorological variables affecting CAPI, (3) mechanisms behind CAPI, and (4) quantification of CAPI and their impact on climate. Heavy aerosol loading in East Asia has significant radiative effects by reducing surface radiation, increasing the air temperature, and lowering the boundary layer height. A key factor is aerosol absorption, which is particularly strong in central China. This absorption can have a wide range of impacts such as creating an imbalance of aerosol radiative forcing at the top and bottom of the atmosphere, leading to inconsistent retrievals of cloud variables from space‐borne and ground‐based instruments. Aerosol radiative forcing can delay or suppress the initiation and development of convective clouds whose microphysics can be further altered by the microphysical effect of aerosols. For the same cloud thickness, the likelihood of precipitation is influenced by aerosols: suppressing light rain and enhancing heavy rain, delaying but intensifying thunderstorms, and reducing the onset of isolated showers in most parts of China. Rainfall has become more inhomogeneous and more extreme in the heavily polluted urban regions.

show abstract

Section: Aerosol Formation Nucleation Optical Properties and Radiamentioning

confidence: 99%

East Asian Study of Tropospheric Aerosols and their Impact on Regional Clouds, Precipitation, and Climate (EAST‐AIR_CPC)

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, it is also noted that during the process of dust transport, dry‐and‐wet depositions are nonnegligible factors influencing the dust loading in the downstream regions (Dai et al, ; Guo et al, ; Yim et al, ). Interestingly, soil moisture in China has shown to be experiencing significant increasing trend in recent decade (Guo et al, ), which could be due to the fast greening speed through land use management in this region (C. Chen, Park, et al, ). Therefore, the changes in soil moisture should also be taken into account when analyzing the long‐term trend of dust over East Asia and the North Pacific Ocean (EA&NPO).…”

Section: Introductionmentioning

confidence: 99%

The Trend Reversal of Dust Aerosol Over East Asia and the North Pacific Ocean Attributed to Large‐Scale Meteorology, Deposition, and Soil Moisture

Guo

Liu

et al. 2019

JGR Atmospheres

Self Cite

View full text Add to dashboard Cite

The long‐term trend in dust loading over East Asia remains under debate and is dependent on the study period chosen. In this study, the long‐term trends in springtime dust over East Asia and the North Pacific Ocean (NPO) during 1980–2017 were examined based on the Modern‐Era Retrospective Analysis for Research and Applications version 2 reanalysis. Results showed that there was a spatial gradient in dust aerosol loadings, with decreases from western China eastward toward the NPO. This pattern was corroborated by Cloud‐Aerosol Lidar with Orthogonal Polarization observations. Furthermore, the empirical orthogonal function method was used to reveal the leading modes of springtime dust aerosol optical depth (AOD) over East Asia and the NPO. An abrupt shift occurred in the dust AOD trend in 2010 for the empirical orthogonal function 1 mode. The dust AOD increased at a rate of approximately 2 × 10‐4/year during 1999–2009 and then decreased more sharply (around 5 × 10‐4/year) afterward. This trend reversal of dust AOD was closely associated with a decrease in 10‐m wind velocity, which induces reduced dust emission. Compared with 10‐m wind, the soil moisture is less correlated with the trend reversal in dust AOD. Additionally, the trends of dry (wet) deposition were closely associated with the trends of the dust AOD, especially for the period 2010–2016. Overall, our findings add new insights to the long‐term nonlinear variability of dust.

show abstract

“…The impact of climate change effects predicted by the Intergovernmental Panel on Climate Change scenarios indicated that Brazilian urban populations are likely to become more exposed to the adverse urban effects such as significant reduction on precipitation and augment in temperature (Batista et al, ; Lyra et al, ). On the other hand, long‐term variation of PBL height carried out in Europe, China, and Japan (Guo et al, ; Zhang et al, ; Zhang & Li, ) indicated that there is an overall tendency to increase the PBL height as a response to the global warming, mainly increase in the surface temperature and reduction in the relative humidity. However, it is still not possible to infer what would be the impact of the Intergovernmental Panel on Climate Change scenarios on the PBL heights over urban areas.…”

Section: Summary and Concluding Remarksmentioning

confidence: 99%

Rawinsonde‐Based Analysis of the Urban Boundary Layer in the Metropolitan Region of São Paulo, Brazil

Sánchez

Oliveira

Varona

et al. 2020

Earth and Space Science

View full text Add to dashboard Cite

The main features of the urban boundary layer in the metropolitan region of São Paulo are estimated based on rawinsondes carried out (a) every 3 hr in two 10‐day field campaigns of the MCITY BRAZIL Project during the summer and winter of 2013 and (b) regularly once per day and continuously for 4 years from 2009 to 2013. On average, the boundary layer height showed a daytime maximum of 1476 ± 149 m in summer and 1122 ± 168 m in winter campaigns. The differences are related to seasonal variations in the (a) buoyancy flux at the surface, which was 30% larger in summer (4.7 ± 0.6 MJ m−2 day−1), and the (b) static stability of the free atmosphere, which was 15% smaller in summer (3.3 ± 0.1 K km−1). The average nighttime boundary layer height, estimated from equilibrium empirical expression, indicated maximum of 126 ± 13 m in summer and 122 ± 10 m in winter campaigns. The presence of a low‐level jet was identified in 80% of the field campaign nights, with intensity varying from 2.7 to 14 m s−1 and height ranging from 95 to 962 m. The nighttime residual‐mixing layer is well estimated using the air temperature gradient method and is a good indication of the maximum vertical evolution of the previous daytime boundary layer. The monthly average maximum boundary layer height varied from a minimum of 1,061 ± 77 m in September to maximum of 1,632 ± 96 m in May.

show abstract

Shift in the Temporal Trend of Boundary Layer Height in China Using Long‐Term (1979–2016) Radiosonde Data

Cited by 147 publications

References 61 publications

East Asian Study of Tropospheric Aerosols and their Impact on Regional Clouds, Precipitation, and Climate (EAST‐AIR_CPC)

East Asian Study of Tropospheric Aerosols and their Impact on Regional Clouds, Precipitation, and Climate (EAST‐AIR_CPC)

The Trend Reversal of Dust Aerosol Over East Asia and the North Pacific Ocean Attributed to Large‐Scale Meteorology, Deposition, and Soil Moisture

Rawinsonde‐Based Analysis of the Urban Boundary Layer in the Metropolitan Region of São Paulo, Brazil

Contact Info

Product

Resources

About

Shift in the Temporal Trend of Boundary Layer Height in China Using Long‐Term (1979–2016) Radiosonde Data

Cited by 147 publications

References 61 publications

East Asian Study of Tropospheric Aerosols and their Impact on Regional Clouds, Precipitation, and Climate (EAST‐AIRCPC)

East Asian Study of Tropospheric Aerosols and their Impact on Regional Clouds, Precipitation, and Climate (EAST‐AIRCPC)

The Trend Reversal of Dust Aerosol Over East Asia and the North Pacific Ocean Attributed to Large‐Scale Meteorology, Deposition, and Soil Moisture

Rawinsonde‐Based Analysis of the Urban Boundary Layer in the Metropolitan Region of São Paulo, Brazil

Contact Info

Product

Resources

About

East Asian Study of Tropospheric Aerosols and their Impact on Regional Clouds, Precipitation, and Climate (EAST‐AIR_CPC)

East Asian Study of Tropospheric Aerosols and their Impact on Regional Clouds, Precipitation, and Climate (EAST‐AIR_CPC)