1 / 4

State of Knowledge: Impact of Sea Level Rise

State of Knowledge: Impact of Sea Level Rise. Broad spectrum of impacts Geophysical (land loss, shoreline erosion, encroachment of ocean threatening estuaries/bays/rivers, increased susceptibility to storm surges, longer ice-free periods, change in energy balance)

yair
Télécharger la présentation

State of Knowledge: Impact of Sea Level Rise

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. State of Knowledge: Impact of Sea Level Rise • Broad spectrum of impacts • Geophysical (land loss, shoreline erosion, encroachment of ocean threatening estuaries/bays/rivers, increased susceptibility to storm surges, longer ice-free periods, change in energy balance) • Biological (stress to systems already stressed; changes in temperature-related physiology, species redistribution/loss, coastal ecosystem redistribution/loss, coral reef loss, loss of habitat for fisheries) • Societal (coastal population [40% w/in 100km of shore], economy and infrastructure [much of ~$50 trillion global economy], loss of agricultural land, increased vulnerability from storms, costly protective measures, saltwater intrusion, increased period of ice-free navigation)

  2. Key Processes: Sources of 1-2 mm/yr SLR Some changes from Arctic Many extra-Arctic • Site/region-specific & complex interactions…f(deformation of geoid, glacial rebound, temp., “system memory” + more “modern” changes) • No acceleration noted • Steric effects (thermal expansion, changes in salinity [0.2m volume]) • Melting of mountain glaciers ([0.5 m volume]) • Ice sheets (Greenland [6m volume]; Antarctica [65m volume]). • Non-climate factors (extraction of fossil groundwater [+ influence] , reservoir filling behind dams [- influence]; [4m volume])

  3. Deltas Under Threat Sea Level Rise Only Part of the Story Historical Analysis of 40 Sample Basins 8 • Sources of Change: • -- 8 Sea Level Rise • -- 7 Subsidence (groundwater/petroleum extraction) • -- 25 Upstream sediment trapping and diversion 7 25

  4. Cloud Feedback ? • Degree to which this is a positive/negative feedback remains an open question Issues Critical to This Synthesis • Isolate Arctic vs Extra-Arctic Forcings • In Arctic, the ffw processes could be relevant: Assume reduction in sea ice cover/thickness:

More Related