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

Datos Bibliográficos

ID15548544
AutoresJing Li (0000-0001-7792-4322, Peking University, autor de correspondencia), Yiqi Chu (0000-0003-3646-8580, Beijing Institute of Radio Metrology and Measurement), Xichen Li (0000-0001-6325-6626, Institute of Atmospheric Physics, autor de correspondencia), Yueming Dong (0000-0001-8897-128X, Peking University)
Año2020
Volumen15
Número3
Páginas034054-034054
Fecha de publicación2020-02-24
Peer ReviewedSí
Open AccessSí
TipoARTICLE
RevistaEnvironmental Research Letters (JOURNAL)
Identificadores de la revistaISSN: 1748-9326 • E-ISSN: 1748-9326
EditorialIOP Publishing (PUBLISHER • GB)
DOI10.1088/1748-9326/ab7952
OpenAlexW3008186522
IdiomaEN
Referencias citadas29

The height of the atmospheric mixed layer is a critical parameter controlling the vertical dispersion of pollutants. Here we calculate daily maximum mixed layer height (MMLH) using operational radiosonde and surface meteorological measurements made at 219 carefully selected WMO weather stations and analyze their long-term trends from 1973 to 2018. We found that 74 stations showed significant increases in MMLH, whereas 48 sites showed negative trends. Positive trends are mainly found in Central US, Europe, Africa, East and Southeast Asia and East Australia. Stations over the coastal US, India and West Australia generally exhibit negative trends. The trends can be attributed to changes in vertical temperature gradient ∇ θ v between 950 and 700 hPa and diurnal temperature range (DTR). ∇ θ v in general decreased and caused positive MMLH trends over the majority of the regions. DTR decreases globally, causing negative MMLH trends (corresponding to decreased DTR), and plays a more important role over India and Central Asia

Algorithm · Atmospheric sciences · Geography · Meteorology · Radiosonde · Atmospheric aerosols and clouds · Atmospheric chemistry and aerosols · Climate variability and models · Mathematics · Geology