The Subtropical Stratocumulus-Topped Planetary Boundary Layer: A Climatology and the Lagrangian Evolution
作者： Ryan Eastman , Robert Wood , Kuan Ting O
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摘要: AbstractPrior work has shown that deeper planetary boundary layers (PBLs) are associated with cloud breakup and reduced droplet concentration in subtropical stratocumulus decks, motivating a need for thorough understanding of PBL mechanics. Here, 169 000 layer trajectories calculated four eastern ocean basins following reanalysis winds at 925 mb (1 = 1 hPa). These combined twice-daily cloud-top-height-inferred depth product allow comprehensive Lagrangian analysis the (Sc)-topped as deck transitions from Sc to trade cumulus (Cu). Month-to-month variations this strongly positively correlated an independent derived GPS radio occultation.A climatology shows deepening offshore every region. The yearly cycle varies opposition lower-tropospheric stability (LTS), but high-frequency variation between LTS is more ...
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