[Virtual] GFDL Lunchtime Seminar

Wed, Oct 28, 2020, 12:00 pm to 1:00 pm

Cloud-aerosol interactions remain a major obstacle to understanding climate and severe weather. Observations suggest that aerosols enhance tropical thunderstorm activity; past research, motivated by the importance of understanding aerosol impacts on clouds, has proposed several mechanisms that could explain that observed link. Here, we show that cloud-resolving models run under the weak temperature gradient approximation can reproduce the observed link between aerosols and convection. However, we also show that previously-proposed mechanisms are unable to explain the invigoration. Examining underlying processes reveals that, in our simulations, high aerosol concentrations increase environmental humidity by producing clouds that mix more condensed water into the surrounding air. In turn, higher humidity favors large-scale ascent and stronger convection. Scale analysis of the effects of humidity on the temperature of entraining plumes, as compared to the effects of fusion of cloud water, further supports our finding that cloud-environment interactions can play a major role in altering updraft properties. Overall, our results provide a novel physical reason to expect invigorated thunderstorms in high-aerosol regions of the tropics.

Location: 
Virtual
Speaker(s): 

[Virtual] David Bradford Energy and Environmental Policy Seminar

Mon, Oct 26, 2020, 12:15 pm to 1:15 pm
Location: Zoom

[Virtual] Environmental Geology & Geochemistry Seminar (EGGS)

Tue, Oct 27, 2020, 12:30 pm to 1:20 pm
Location: Virtual

[Virtual] Energy Table

Tue, Oct 27, 2020, 3:00 pm to 4:00 pm
Location: Virtual

[Virtual] GFDL Lunchtime Seminar

Wed, Oct 28, 2020, 12:00 pm to 1:00 pm
Location: Virtual

[Virtual] GFDL Formal Seminar

Thu, Oct 29, 2020, 2:00 pm to 3:00 pm
Location: Virtual

[Virtual] David Bradford Energy and Environmental Policy Seminar

Mon, Nov 2, 2020, 12:15 pm to 1:15 pm
Location: Zoom

[Virtual] PEI Faculty Seminar

Tue, Nov 3, 2020, 12:30 pm to 1:30 pm
Location: Zoom

[Virtual] GFDL Formal Seminar

Thu, Nov 5, 2020, 2:00 pm to 3:00 pm
Location: Virtual

[Virtual] David Bradford Energy and Environmental Policy Seminar

Mon, Nov 9, 2020, 12:15 pm to 1:15 pm
Location: Zoom

[Virtual] Environmental Geology & Geochemistry Seminar (EGGS)

Tue, Nov 10, 2020, 12:30 pm to 1:20 pm
Location: Virtual