Long-term trends of global maximum atmospheric mixed layer heights derived from radiosonde measurements

Li, Jing; Chu, Yiqi; Li, Xichen; Dong, Yihan

doi:10.1088/1748-9326/ab7952

Cited by 14 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since radiosonde soundings were not available at noon, we adopted the parcel method proposed by Holzworth (1964). This widely used method continuously tracks PBLHs, based on a morning radiosonde sounding combined with daily meteorological data (Karimian et al, 2016; Li et al, 2020; Zhang et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

Abnormally Shallow Boundary Layer Associated With Severe Air Pollution During the COVID‐19 Lockdown in China

Zheng

et al. 2020

Geophysical Research Letters

View full text Add to dashboard Cite

After the 2020 Lunar New Year, the Chinese government implemented a strict nationwide lockdown to inhibit the spread of the Coronavirus Disease 2019 (COVID-19). Despite the abrupt decreases in gaseous emissions caused by record-low anthropogenic activities, severe haze pollution occurred in northern China during the COVID lockdown. This paradox has attracted the attention of both the public and the scientific community. By analyzing comprehensive measurements of air pollutants, planetary boundary layer (PBL) height, and surface meteorology, we show that the severe air pollution episode over northern China coincided with the abnormally low PBL height, which had reduced by 45%, triggering strong aerosol-PBL interactions. After dynamical processes initiated the temperature inversion, the Beijing metropolitan area experienced a period with continuously shallow PBLs during the lockdown. This unprecedented event provided an experiment showcasing the role of meteorology, in particular aerosol-PBL interactions in affecting air quality.

show abstract

Section: Methodsmentioning

confidence: 99%

Abnormally Shallow Boundary Layer Associated With Severe Air Pollution During the COVID‐19 Lockdown in China

Zheng

et al. 2020

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…Regional studies report positive PBLH trends during recent decades in, for example, Iran (Darand and Zandkarimi, 2019), Europe (Zhang et al ., 2013) and Japan (Zhang and Li, 2019). A global study of atmospheric mixed layer height (i.e., the height of the convective boundary layer) found positive trends in Europe, Africa, Central US, East Australia, East Asia and Southeast Asia, and negative trends in coastal US, India and West Australia (Li et al ., 2020). Guo et al .…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal patterns of planetary boundary layer height during 1979–2018 over the Tibetan Plateau using ERA5

Slättberg

Lai

Xuelong

et al. 2021

Intl Journal of Climatology

View full text Add to dashboard Cite

Planetary boundary layer height (PBLH) is a key meteorological parameter that is affected by and influences exchanges of energy, momentum, and mass between the surface and the atmosphere, but there are few comprehensive studies on the PBLH climatology over the Tibetan Plateau (TP). This study presents a multi‐decadal climatology of PBLH over the TP by using high‐resolution reanalysis data (ERA5) for the period 1979–2018. The ERA5 PBLH was first evaluated against radiosonde‐derived PBLH from four sites. For most of the observation periods and sites, ERA5 captured the diurnal cycles reasonably well, although the highest peaks in the radiosonde‐derived PBLH were often not captured. Next, long‐term means and trends, seasonality and diurnal cycles of the PBLHs were examined. The results show that average PBLHs in the central and southwestern TP are higher than those in the west and east. On an interannual time scale, the PBLH is positively correlated with the North Atlantic Oscillation in western and southeastern TP in winter, eastern TP in summer, and central TP in autumn, while a negative correlation is seen for northeastern TP in winter. The summertime PBLH in the central and southwestern TP is negatively correlated to the Indian summer monsoon. As for the seasonal cycle, the PBLH in the western TP reaches its peak in August, while the PBLH in the eastern TP exhibits an earlier summer peak in June. In the central TP, the PBLH is the highest in April and displays a minimum during summer, corresponding to a precipitation peak and a dip in surface sensible heat flux. The climatological diurnal cycles of PBLH are generally affected by the insolation and reach their peaks in the afternoon when a large range in PBLH variation is also found.

show abstract

“…( 1 a positive trend in association with warming. On the other hand, trend is not unform spatially with even negative values around the Indian subcontinent particularly in winter and spring (see also Li et al 2020).…”

Section: The Effect Of Regional Warmingmentioning

confidence: 97%

Diurnal and Seasonal Variation of Planetary Boundary Layer Height over East Asia and Its Climatic Change as Seen in the ERA-5 Reanalysis Data

Kim

2021

Preprint

View full text Add to dashboard Cite

The diurnal/seasonal structure of the boundary layer height (BLH) is investigated over East Asia by using the hourly synoptic monthly ERA5 reanalysis variables from 1979–2019. Sensible heat flux (SHF) is the major factor in the temporal and spatial variation of the BLH. Although BLH, in general, is positively correlated with SHF throughout the year, BLH-SHF relationship varies significantly based on the surface type, latitude and time of the year. Analysis also reveals that stability is an important parameter controlling the diurnal maximum BLH. The growth of BLH is strongly limited by the presence of a stable layer. On the other hand, BLH increases abruptly in the presence of a weakly stratified residual layer. In addition, regional warming tends to increase the BLH in the mid- to high-latitude continental area. In the low-latitude continental area, the sign of SHF differs seasonally and regionally. Stability plays only a minor role in the BLH change except over the Tibetan Plateau, where the increased stability at the top of boundary layer due to warming reduces BLH rather significantly.

show abstract

Long-term trends of global maximum atmospheric mixed layer heights derived from radiosonde measurements

Cited by 14 publications

References 30 publications

Abnormally Shallow Boundary Layer Associated With Severe Air Pollution During the COVID‐19 Lockdown in China

Abnormally Shallow Boundary Layer Associated With Severe Air Pollution During the COVID‐19 Lockdown in China

Spatial and temporal patterns of planetary boundary layer height during 1979–2018 over the Tibetan Plateau using ERA5

Diurnal and Seasonal Variation of Planetary Boundary Layer Height over East Asia and Its Climatic Change as Seen in the ERA-5 Reanalysis Data

Contact Info

Product

Resources

About