1 / 2

Lightning and upper-tropospheric water vapor (UTWV)

Lightning and upper-tropospheric water vapor (UTWV). Theory Water vapor should increase with increasing temperature UTWV increases even more so, due to transport: Deep convection deposits large amounts of water vapor in the upper troposphere – largely through sublimation of anvil ice

jules
Télécharger la présentation

Lightning and upper-tropospheric water vapor (UTWV)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lightning and upper-tropospheric water vapor (UTWV) Theory Water vapor should increase with increasing temperature UTWV increases even more so, due to transport: Deep convection deposits large amounts of water vapor in the upper troposphere – largely through sublimation of anvil ice So should UTWV vary with lightning activity on regional to global scales? UTWV thought to act as a positive feedback to warming – additional positive feedback by increasing frequency/intensity of deep convection? A complex question: Diagnostic for climate change (more lightning/storms = more UTWV) As a feedback process – increase absorption of longwave radiation by water vapor  warming  increased deep convection? Price (2000) Price and Asfur (2006)

  2. NASA Water Vapor Project (NVAP) NCEP-NCAR Reanalyses Challenges: Difficulty of measuring water vapor on a global scale How to measure global lightning activity (easily)? – Price (2000), Price and Asfur(2006) propose use of Schumann resonances – easily measurable ELF radiation at any location around the globe; very well correlated with UTWV Schumann resonance variability as an indicator of UTWV variability – simple means to measure global lightning activity; no complex global detection necessary If Schumann resonance magnetic field amplitudes (what’s shown in plots) increase over time, can we infer a similar change in UTWV – preliminary studies suggest we can – need better water vapor measurements! Price (2000), Price and Asfur (2006)

More Related