The coupled Hudson River estuarine-plume response to variable wind and river forcings |
| |
| Authors: | Joseph T Jurisa Robert Chant |
| |
| Institution: | (1) Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ 08901, USA |
| |
| Abstract: | Observations of the Hudson River plume were taken in the spring of 2006 in conjunction with the Lagrangian Transport and Transformation
Experiment using mooring arrays, shipboard observations, and satellite data. During this time period, the plume was subjected
to a variety of wind, buoyant, and shelf forcings, which yield vastly different responses in plume structure including a downstream
recirculating eddy. During weak and downwelling winds, the plume formed a narrow buoyant coastal current that propagated downstream
near the internal wave speed. Freshwater transport during periods when the downwelling wind was closely aligned with the coast
was near the river discharge values. During periods with a cross-shore component to the wind, freshwater transport in the
coastal current estimated by the mooring array is less than the river discharge due to a widening of the plume that leads
to the internal Rossby radius scaling for the plume width to be invalid. The offshore detachment of plume and formation of
a downstream eddy that is observed surprisingly persisted for 2 weeks under a variety of wind forcing conditions. Comparison
between mooring, shipboard, and satellite data reveal the downstream eddy is steady in time. Shipboard transects yield a freshwater
content equal to the previous 3 days of river discharge. The feature itself was formed due to a large discharge following
a strong onshore wind. The plume was then further modified by a brief upwelling wind and currents influenced by the Hudson
Shelf Valley. The duration of the detachment and downstream eddy can be explained using a Wedderburn number which is largely
consistent with the wind strength index described by Whitney and Garvine (J Geophys Res 110:C03014 1997). |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
