Tracking California’S Sinking Coast From Space: Implications For Relative Sea-Level Rise

Details

• Journal Title:
  Science Advances
• Personal Author:
  Blackwell, Em ; Shirzaei, Manoochehr ; Ojha, Chandrakanta ; Werth, Susanna
• NOAA Program & Office:
  Sea Grant ; OAR (Oceanic and Atmospheric Research)
• Sea Grant Program:
  SCU (Southern California Sea Grant)
• Description:
  Coastal vertical land motion affects projections of sea-level rise, and subsidence exacerbates flooding hazards. Along the ~1350-km California coastline, records of high-resolution vertical land motion rates are scarce due to sparse instrumentation, and hazards to coastal communities are underestimated. Here, we considered a ~100-km-wide swath of land along California’s coast and performed a multitemporal interferometric synthetic aperture radar (InSAR) analysis of large datasets, obtaining estimates of vertical land motion rates for California’s entire coast at ~100-m dimensions—a ~1000-fold resolution improvement to the previous record. We estimate between 4.3 million and 8.7 million people in California’s coastal communities, including 460,000 to 805,000 in San Francisco, 8000 to 2,300,00 in Los Angeles, and 2,000,000 to 2,300,000 in San Diego, are exposed to subsidence. The unprecedented detail and submillimeter accuracy resolved in our vertical land motion dataset can transform the analysis of natural and anthropogenic changes in relative sea-level and associated hazards.
• Keywords:
  Coasts Remote Sensing Sea Level Remote Sensing Sea Level
• Source:
  Science Advances 6(31), 2020
• DOI:
  https://doi.org/10.1126/sciadv.aba4551
• Sea Grant Document Number:
  SCU-R-20-008
• Document Type:
  Journal Article
• Place as Subject:
  California
• Rights Information:
  CC BY
• Compliance:
  Library
• Main Document Checksum:
  urn:sha256:bc1ecc77df729146f590fca196390965fefd46d137fb6d651243f95d16b56c70
• Download URL:
  https://repository.library.noaa.gov/view/noaa/37477/noaa_37477_DS1.pdf
• File Type:
  [PDF - 4.51 MB ]