TY - JOUR
T1 - The pressure gradient conundrum of sigma coordinate ocean models
AU - Mellor, G. L.
AU - Ezer, T.
AU - Oey, L. Y.
PY - 1994
Y1 - 1994
N2 - It is shown that the differencing scheme cited here, though conventional, is not hydrostatically inconsistent; the sigma coordinate, pressure gradient error decreases with the square of the vertical and horizontal grid size. Furthermore, it is shown that the pressure gradient error is advectively eliminated after a long time integration. At the other extreme, it is shown that diagnostic calculations of the North Atlantic Ocean using rather coarse resolution, and where the temperature and salinity and the pressure gradient error are held constant, do not exhibit significant differences when compared to a calculation where horizontal pressure gradients are computed on z-level coordinates. Finally, a way of canceling the error ab initio is suggested. -from Authors
AB - It is shown that the differencing scheme cited here, though conventional, is not hydrostatically inconsistent; the sigma coordinate, pressure gradient error decreases with the square of the vertical and horizontal grid size. Furthermore, it is shown that the pressure gradient error is advectively eliminated after a long time integration. At the other extreme, it is shown that diagnostic calculations of the North Atlantic Ocean using rather coarse resolution, and where the temperature and salinity and the pressure gradient error are held constant, do not exhibit significant differences when compared to a calculation where horizontal pressure gradients are computed on z-level coordinates. Finally, a way of canceling the error ab initio is suggested. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0028579044&partnerID=8YFLogxK
U2 - 10.1175/1520-0426(1994)011<1126:tpgcos>2.0.co;2
DO - 10.1175/1520-0426(1994)011<1126:tpgcos>2.0.co;2
M3 - 期刊論文
AN - SCOPUS:0028579044
SN - 0739-0572
VL - 11
SP - 1126
EP - 1134
JO - Journal of Atmospheric and Oceanic Technology
JF - Journal of Atmospheric and Oceanic Technology
IS - 4 part 2
ER -