Observational evidence for aerosols increasing upper tropospheric humidity
Riuttanen, Laura; Bister, Marja; Kerminen, Veli-Matti; John, Viju O.; Sundstrom, Anu-Maija; Dal Maso, Miikka; Räisänen, Jouni; Sinclair, Victoria A.; Makkonen, Risto; Xausa, Filippo; de Leeuw, Gerrit; Kulmala, Markku (2016-11-17)
Riuttanen, Laura
Bister, Marja
Kerminen, Veli-Matti
John, Viju O.
Sundstrom, Anu-Maija
Dal Maso, Miikka
Räisänen, Jouni
Sinclair, Victoria A.
Makkonen, Risto
Xausa, Filippo
de Leeuw, Gerrit
Kulmala, Markku
17.11.2016
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201612224909
https://urn.fi/URN:NBN:fi:tty-201612224909
Kuvaus
Peer reviewed
Tiivistelmä
Aerosol-cloud interactions are the largest source of uncertainty in the radiative forcing of the global climate. A phenomenon not included in the estimates of the total net forcing is the potential increase in upper tropospheric humidity (UTH) by anthropogenic aerosols via changes in the microphysics of deep convection. Using remote sensing data over the ocean east of China in summer, we show that increased aerosol loads are associated with an UTH increase of 2.2 +/- 1.5 in units of relative humidity. We show that humidification of aerosols or other meteorological covariation is very unlikely to be the cause of this result, indicating relevance for the global climate. In tropical moist air such an UTH increase leads to a regional radiative effect of 0.5 +/- 0.4 W m(-2). We conclude that the effect of aerosols on UTH should be included in future studies of anthropogenic climate change and climate sensitivity.
Kokoelmat
- TUNICRIS-julkaisut [16944]