Evidence Of Salt Accumulation In Beach Intertidal Zone Due To Evaporation

Details

• Journal Title:
  Scientific Reports
• Personal Author:
  Geng, Xiaolong ; Boufadel, Michel C. ; Jackson, Nancy L.
• NOAA Program & Office:
  Sea Grant ; OAR (Oceanic and Atmospheric Research)
• Sea Grant Program:
  NJSGC/NJMSC (New Jersey Sea Grant Consortium)
• Description:
  In coastal environments, evaporation is an important driver of subsurface salinity gradients in marsh systems. However, it has not been addressed in the intertidal zone of sandy beaches. Here, we used field data on an estuarine beach foreshore with numerical simulations to show that evaporation causes upper intertidal zone pore-water salinity to be double that of seawater. We found the increase in pore-water salinity mainly depends on air temperature and relative humidity, and tide and wave actions dilute a fraction of the high salinity plume, resulting in a complex process. This is in contrast to previous studies that consider seawater as the most saline source to a coastal aquifer system, thereby concluding that seawater infiltration always increases pore-water salinity by seawater-groundwater mixing dynamics. Our results demonstrate the combined effects of evaporation and tide and waves on subsurface salinity distribution on a beach face. We anticipate our quantitative investigation will shed light on the studies of salt-affected biological activities in the intertidal zone. It also impacts our understanding of the impact of global warming; in particular, the increase in temperature does not only shift the saltwater landward, but creates a different salinity distribution that would have implications on intertidal biological zonation.
• Keywords:
  Climate Change Coastal Ecology Salinity Climate Change Coastal Ecology
• Source:
  Scientific Reports 6 (31486)
• DOI:
  https://doi.org/10.1038/srep31486
• Pubmed Central ID:
  PMC4980607
• Document Type:
  Journal Article
• Funding:
  Grant no. NA10OAR4170075
• Rights Information:
  CC BY
• Compliance:
  PMC
• Main Document Checksum:
  urn:sha-512:998dddc91c56cdbfc28dac04ae94ca6c5de3a8a4533e3190b214c2b10dd4fa0b2f846f2c9de0036a2d128fdef69cc992a0045d6a4d0f5eacef866e9fcb398e4d
• Download URL:
  https://repository.library.noaa.gov/view/noaa/24074/noaa_24074_DS1.pdf
• File Type:
  [PDF - 1.45 MB ]