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X-WR-CALNAME;VALUE=TEXT:UMCES Events
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DTSTART:20191103T020000
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DTSTART:20200308T020000
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BEGIN:VEVENT
UID:calendar.4896.field_date_time.0@www.umces.edu
DTSTAMP:20260405T183356Z
CREATED:20191111T175334Z
DESCRIPTION:November 13\, 2019 11:00am to 12:00pm    \n    \n      \n\n\n  
   \n\n              \nHorn Point Laboratory\n      \n\n\n\n\n  \n\n    \n
 \n              \n\n\n          \n\n              \n\n    \n\n            
   \n  \n  \n      \n\n          \n  \n  \n\n    \n\n              \n\n\nJu
 lie Granger\, faculty member at University of Connecticut in Marine Scienc
 es\, will be presenting 'Inshore nutrient trapping increases the fertility
  of the Southern Benguela Upwelling System'.\n\n\n\nSeminar abstract: The 
 southern Benguela upwelling system (SBUS) supports high rates of primary p
 roductivity that sustain important commercial fisheries. The exceptional f
 ertility of this system is reportedly fueled not only by upwelled nutrient
 s\, but also by nutrients regenerated on the broad and shallow continental
  shelf. We measured nutrient concentrations and the nitrogen (N) and oxyge
 n (O) isotope ratios (δ15N and δ18O) of nitrate along four zonal lines in 
 the SBUS in late summer and early winter to evaluate the extent to which r
 egenerated nutrients augment the shelf nutrient reservoir. During summer u
 pwelling\, a decrease in on-shelf nitrate δ18O revealed that\, on average\
 , 30% of the subsurface nutrients derived from in situ remineralization. W
 hile a similar proportion of the on-shelf nitrate was regenerated in the m
 ore quiescent winter (35%)\, this signal extended further along the mid-sh
 elf\, such that the total regenerated nitrate burden was greater during wi
 nter. A shoreward increase in subsurface nitrate δ15N and a greater N defi
 cit in on-shelf bottom waters further indicated N loss to benthic (and in 
 some instances\, water column) denitrification coincident with the on-shel
 f remineralization. Our data show that remineralized nutrients get trapped
  on the SBUS shelf in summer through early winter\, enhancing the nutrient
  pool that can be upwelled to support surface production. We hypothesize t
 hat this process is aided by a number of hydrographic fronts that impede t
 he lateral exchange of surface waters. The extent to which nutrients remai
 n trapped on the shelf likely has implications for the occurrence of hypox
 ic events in the SBUS.
DTSTART;TZID=America/New_York:20191113T110000
DTEND;TZID=America/New_York:20191113T120000
LAST-MODIFIED:20191111T180232Z
SUMMARY:HPL Seminar: Julie Granger (Associate Professor of Marine Sciences\
 , University of Connecticut)
URL;TYPE=URI:https://www.umces.edu/events/hpl-seminar-julie-granger-associa
 te-professor-marine-sciences-university-connecticut
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