[ecco-support] Two questions about ECCO V4r2

[Wang, Ou (329B)]

Qihua,

The v4 configuration specifies that the global ocean is partitioning into 96 30x30 tiles. Aligning the 96 tiles in one queue gives the X-direction size (NX) 96x30 and the Y-direction size (NY) 30. Note that x-direction and y-direction are not necessarily the longitude and latitude directions. So 2880=96*30 in X-direction does NOT mean that there are 2880 grids in the longitudinal direction.

The direction convention for the wind stress forcing is that positive is from east to west for ustr and from north to south for vstr.

Best,
Ou Wang

From: <ecco-support-bounces at mit.edu<mailto:ecco-support-bounces at mit.edu>> on behalf of Qihua Peng <q7peng at ucsd.edu<mailto:q7peng at ucsd.edu>>
Reply-To: "ECCO support list, wider membership" <ecco-support at mit.edu<mailto:ecco-support at mit.edu>>
Date: Monday, December 4, 2017 at 1:53 PM
To: "ecco-support at mit.edu<mailto:ecco-support at mit.edu>" <ecco-support at mit.edu<mailto:ecco-support at mit.edu>>
Subject: [ecco-support] Two questions about ECCO V4r2

Dear teacher,
Nice to see you. My name is Qihua Peng, a student of UCSD. Recently I tried to rerun the ECCO v4r2, and I have two questions:

1.In terms of the resolution of ECCO v4r2, the file (size.h) shows:  sNx =  30,sNy =  30,OLx =   4,OLy =   4,nSx =   1,nSy =   1,nPx =  96,nPy =   1. It seems the resolution of ECCO v4r2 is : Nx  = sNx*nSx*nPx=2880 in x direction and  Ny  = sNy*nSy*nPy=30 in y direction.  The resolution seems too dense in zonal direction and too coarse in meridional direction. I think there must be something wrong for my understanding of the resolution of LLC90 grid.


2. I have downloaded all the forcing data and I found all the wind stress data have reverse sign such as: westerly zonal wind should be positive in the value but in the forcing data of ECCO (ftp://mit.ecco-group.org/ecco_for_las/version_4/release2/input_forcing/) it's negative, so I'd like to know why is that? Is it due to the LLC90 grid? if it is , I'd like to know how to plot this vector field correctly.

Thanks for your kindness and help.

Bests,
Qihua
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