Transport diagnostics

Computing transport diagnostics requires an input file describing the requested transports. A sample transport input file is provided with the LANL distribution. The transport input file must contain the number of transport regions in the first record. Each following record must contain 6 integers imin, imax, jmin, jmax, kmin, kmax which are global array indices which define the transport region. Note that the region must be a plane so that one of the horizontal dimensions must be fixed.Following these integers must be a 5-character string that specifies 'zonal' or 'merid' transport. Note that this descriptor defines the orientation of the section and not the direction of the velocity normal to it. A 'zonal' section implies the transport across that section uses the meridional velocity (velocity perpendicular to the section). The last item in each record is a name for the transport region (e.g. 'Drake Passage').

Table: Transport descriptions

imin	imax	jmin	jmax	kmin	kmax	section	label
64	64	1	128	1	20	merid	sample meridional section
1	192	64	64	1	10	zonal	sample zonal section

CESM1 Notes

CESM1 POP2 is capable of computing transport diagnostics, such as meridional overturning circulation, northward termperature and salt transports, and zonal averages on an auxilary latitudinal grid. The transports_nml namelist controls the creation of these diagnostics.

Table: Transport diagnostics namelist (CESM1 only)

&transports_nml	CESM1 dipole-grid default	CESM1 tripole-grid default	Valid values	generation of transport diagnostics
lat_aux_grid_type	'southern'	'southern'	'southern', 'full', 'user'	auxilary latitudinal grid choices; see definitions below.
lat_aux_begin	-90.0	-90.0		lower egde coordinate in degrees north; see definitions below.
lat_aux_end	90.0	90.0		upper egde coordinate in degrees north; see definitions below.
n_lat_aux_grid	180.0	180.0		auxilary grid dimension
n_heat_trans_requested	.false.	.true.	.true.,.false.	if .true., compute northward heat transport diagnostics
n_salt_trans_requested	.false.	.true.	.true.,.false.	if .true., compute northward salt transport diagnostics
moc_requested	.false.	.true.	.true.,.false.	if .true., compute meridional overturning circulation diagnostics
transport_reg2_names	('Atlantic Ocean','Mediterranean Sea','Labrador Sea','GIN Sea','Arctic Ocean','Hudson Bay')	('Atlantic Ocean','Mediterranean Sea','Labrador Sea','GIN Sea','Arctic Ocean','Hudson Bay')	array of strings, each ≤ 256 chars	region names associated with region numbers
n_transport_reg	2	2	integer > 0	number of regions for all transport diagnostics
/

The auxilary latitudinal grid choices have the following definitions:

• 'southern' assumes that the model grid is regular lat-lon in the Southern Hemisphere only and uses it identically in the Southern Hemisphere. it is flipped across the Equator and padded at northern high latitudes if necessary.
• 'full' assumes that the entire model grid is regular lat-lon. simply copies this grid into the axilary grid arrays.
• 'user' allows the user to specify an equally-spaced grid, starting at lat_aux_begin and ending at lat_aux_end. the grid dimension/resolution is specified with n_lat_aux_grid. lat_aux_begin and lat_aux_end specify the egde coordinates in degrees north.

The following are the resolution-specific transport contents files for CESM1 POP2. The CESM1 POP2 scripts automatically use the appropriate resolution-specific transport contents file based upon the resolution specified in the create_newcase command.

To customize a transport contents file for your own research, copy the appropriate resolution-specific contents file from your CESM1 distribution into your $CASE/SourceMods/src.pop2 directory, modify it to suit your needs, and then run your case.

gx1v6:

11
 297  297   24   47    1   60 merid  Drake Passage
  65   76  103  103    1   60 zonal  Mozambique Channel
 198  202  333  333    1   60 zonal  Bering Strait
 242  248  372  372    1   60 zonal  Northwest Passage
 131  131  164  167    1   60 merid  Indonesian Throughflow I
 138  161  156  156    1   60 zonal  Indonesian Throughflow II
 284  284  264  270    1   60 merid  Florida Strait
 289  292  258  258    1   60 zonal  Windward Passage I
 292  292  257  258    1   60 merid  Windward Passage II
  32   32  290  295    1   60 merid  Gibraltar
 234  234  373  380    1   60 merid  Nares Strait

gx3v7:

4
  93   93   10   17    1   60 merid  Drake Passage
  61   64   84   84    1   60 zonal  Bering Strait
  45   45   32   38    1   60 merid  Indonesian Throughflow
  89   89   71   73    1   60 merid  Florida Strait

tx0.1v2:

141
 436  436  287  521    1   42 merid  ACC-Drake
 292  292 1418 1443    1   42 merid  Florida Strait
 230  256 1403 1403    1   42 zonal  Yucatan Passage (Zonal)
 256  256 1404 1406    1   42 merid  Yucatan Passage (Merid)
 332  357 1369 1369    1   42 zonal  Jamaica Channel
 350  367 1385 1385    1   42 zonal  Windward Passage
 414  428 1369 1369    1   42 zonal  Mona Passage
 442  470 1366 1366    1   42 zonal  Anegada+Virgin Passage
 470  482 1356 1356    1   42 zonal  Antigua (Zonal)
 469  469 1357 1357    1   42 merid  Antigua (Merid)
 483  483 1348 1356    1   42 merid  Guadeloupe Passage
 486  486 1340 1347    1   42 merid  Dominica Passage
 487  487 1332 1337    1   42 merid  Martinique Passage (Merid)
 488  489 1331 1331    1   42 zonal  Martinique Passage (Zonal)
 491  491 1324 1329    1   42 merid  St Lucia Channel
 489  489 1317 1322    1   42 merid  St Vincent Passage
 484  484 1305 1316    1   42 merid  Grenadines (Merid)
 485  488 1316 1316    1   42 zonal  Grenadines (Zonal)
 484  484 1290 1304    1   42 merid  Trinidad
 470  470 1290 1366    1   42 merid  Antilles Inflow
 300  313 1458 1458    1   42 zonal  Grand Bahama
 320  320 1442 1460    1   42 merid  NW Providence Channel
 324  324 1409 1427    1   42 merid  Old Bahama Channel
 368  368 1385 1397    1   42 merid  Great Inagua
 452  452 1368 1524    1   42 merid  St Thomas-Bermuda
 452  452 1524 1669    1   42 merid  Bermuda-Yarmouth
2929 2947 1979 1979    1   42 zonal  Bering Strait
3141 3141 2239 2284    1   42 merid  Amundsen Gulf
3032 3072 2328 2328    1   42 zonal  MClure Strait
3104 3111 2361 2361    1   42 zonal  Prince of Wales Strait
3021 3030 2368 2368    1   42 zonal  Fitzwilliam Strait
3000 3000 2369 2385    1   42 merid  Ballantyne Strait
2983 2993 2386 2386    1   42 zonal  Wilkins Strait
 623  623 2377 2398    1   42 merid  Gustaf Adolf Strait
 608  608 2382 2400    1   42 merid  Hazen Strait (Merid)
 605  608 2381 2381    1   42 zonal  Hazen Strait (Zonal)
 603  623 2377 2377    1   42 zonal  MacLean Strait
 638  662 2362 2362    1   42 zonal  Peary Channel
 665  665 2348 2358    1   42 merid  Axel Heiber Island
 630  630 2348 2354    1   42 merid  Hassel Sound
 616  621 2332 2332    1   42 zonal  Hendricksen Strait
 599  613 2320 2320    1   42 zonal  Belcher Channel
 619  634 2320 2320    1   42 zonal  Norweigan Bay
 584  584 2323 2337    1   42 merid  Penny Strait
 578  590 2370 2370    1   42 zonal  Desbarats Strait
 559  559 2363 2375    1   42 merid  Byam Martin Channel
 540  540 2368 2375    1   42 merid  Byam Channel
 542  542 2339 2361    1   42 merid  Austin Channel
 550  550 2316 2324    1   42 merid  McDougall Sound
 595  598 2294 2294    1   42 zonal  Cardigan Strait
 554  554 2287 2298    1   42 merid  Wellington Channel
 619  619 2240 2248    1   42 merid  Glacier Strait
 609  617 2238 2238    1   42 zonal  Lady Ann Strait
 582  582 2202 2231    1   42 merid  Lancaster Sound
 576  576 2171 2181    1   42 merid  Pond Inlet
 539  539 2253 2268    1   42 merid  Prince Regent Inlet
 538  555 2275 2275    1   42 zonal  Barrow Strait
 518  518 2299 2311    1   42 merid  Peel Sound
 516  546 2326 2326    1   42 zonal  East Viscount Melville
 501  501 2338 2363    1   42 merid  McClintock Channel
 501  537 2375 2375    1   42 zonal  West Viscount Melville
 366  375 2351 2351    1   42 zonal  Dolphin and Union Strait
 385  385 2295 2307    1   42 merid  Victoria Strait
 386  386 2283 2289    1   42 merid  James Ross Strait
 687  687 2248 2258    1   42 merid  Robeson Channel
 583  656 2010 2010    1   42 zonal  Davis Strait
 522  522 1920 1951    1   42 merid  Hudson Bay
 867  867 1941 2003    1   42 merid  Denmark Strait
 911 1107 1907 1907    1   42 zonal  Iceland-Norway
 921 1022 2215 2215    1   42 zonal  Fram Strait
1097 1388 2211 2211    1   42 zonal  Barents Sea
2241 2241  958 1096    1   42 merid  Indonesian Throughflow
1380 1380  810  833    1   42 merid  Agulhas
1477 1540 1005 1005    1   42 zonal  Mozambique Channel
2125 2135 1196 1196    1   42 zonal  Malacca Strait
2144 2195 1171 1171    1   42 zonal  Karimata Strait
2158 2158 1121 1124    1   42 merid  Sunda Strait
2225 2225 1111 1150    1   42 merid  Java Sea
2255 2261 1095 1095    1   42 zonal  Lombok Strait
2292 2295 1096 1096    1   42 zonal  Sape Strait
2292 2292 1088 1095    1   42 merid  Sumba Passage
2298 2298 1096 1126    1   42 merid  Flores Sea
2275 2297 1175 1175    1   42 zonal  Makassar Strait
2350 2350 1092 1100    1   42 merid  Ombai Strait
2351 2351 1100 1103    1   42 merid  Unknown Strait (Merid)
2352 2359 1103 1103    1   42 zonal  Unknown Strait (Zonal)
2275 2297 1175 1175    1   42 zonal  Makassar Strait
2364 2364 1097 1103    1   42 merid  Wetar Strait
2373 2410 1098 1098    1   42 zonal  Banda-Timor Seas (Zonal)
2410 2410 1099 1100    1   42 merid  Banda-Timor Seas (Merid)
2411 2478 1101 1101    1   42 zonal  Arafura Sea
2419 2428 1111 1111    1   42 zonal  Tanimbar (Zonal)
2428 2428 1112 1124    1   42 merid  Tanimbar (Merid)
2428 2428 1127 1145    1   42 merid  Kai
2408 2428 1145 1145    1   42 zonal  Ceram Sea
2403 2403 1152 1162    1   42 merid  Misool
2404 2404 1165 1180    1   42 merid  Dampier Strait
2380 2404 1180 1180    1   42 zonal  Halmahera Sea
2381 2398 1166 1166    1   42 zonal  Ceram Sea (Zonal)
2398 2398 1162 1166    1   42 merid  Ceram Sea (Merid)
2376 2376 1170 1175    1   42 zonal  Obi Strait
2363 2375 1164 1164    1   42 zonal  Mangole (Zonal)
2375 2375 1165 1166    1   42 merid  Mangole (Merid)
2361 2361 1151 1158    1   42 merid  Sanana
2371 2380 1150 1150    1   42 zonal  Buru
2317 2344 1164 1164    1   42 zonal  Banggai
2352 2376 1197 1197    1   42 zonal  Molucca Sea
2352 2352 1198 1218    1   42 merid  Southeast Celebes Sea (Merid)
2353 2356 1218 1218    1   42 zonal  Southeast Celebes Sea (Zonal)
2356 2356 1218 1241    1   42 merid  Northeast Celebes Sea
2368 2380 1203 1203    1   42 zonal  Talaud (Zonal)
2367 2367 1203 1223    1   42 merid  Talaud (Merid)
2362 2368 1227 1227    1   42 zonal  Mindanao (Zonal)
2361 2361 1227 1247    1   42 merid  Mindanao (Merid)
2293 2293 1236 1247    1   42 merid  Sulu Archipelago (Merid)
2294 2320 1247 1247    1   42 zonal  Sulu Archipelago (Zonal)
2273 2273 1249 1266    1   42 merid  Balabac Strait
2296 2296 1296 1301    1   42 merid  Linapacan Strait (Merid)
2297 2300 1301 1301    1   42 zonal  Linapacan Strait (Zonal)
2300 2311 1306 1306    1   42 zonal  Mindoro Strait
2313 2320 1302 1302    1   42 zonal  Tablas Strait (Zonal)
2312 2312 1303 1306    1   42 merid  Tablas Strait (Merid)
2332 2332 1268 1274    1   42 merid  Bohol Sea
2183 2299 1345 1345    1   42 zonal  South China Sea
2525 2525 1074 1090    1   42 merid  Torres Strait
2309 2309 1372 1408    1   42 merid  Luzon Strait
2302 2302 1426 1463    1   42 merid  Taiwan Strait
2318 2338 1434 1434    1   42 zonal  Ryuku1
2339 2354 1434 1434    1   42 zonal  Ryuku2 (Zonal)
2354 2354 1435 1438    1   42 merid  Ryuku2 (Merid)
2354 2354 1435 1454    1   42 merid  Ryuku3 (Merid)
2355 2378 1454 1454    1   42 zonal  Ryuku3 (Zonal)
2383 2383 1461 1476    1   42 merid  Ryuku4 (Merid)
2384 2393 1476 1476    1   42 zonal  Ryuku4 (Zonal)
2397 2405 1479 1479    1   42 zonal  Tokara Strait (Zonal)
2405 2405 1480 1499    1   42 merid  Tokara Strait (Merid)
2407 2407 1500 1509    1   42 merid  Ohsumi Strait
2396 2396 1532 1546    1   42 merid  Southern Korea Strait
2396 2396 1547 1557    1   42 merid  Northern Korea Strait
2508 2508 1618 1622    1   42 merid  Tsugaru Strait
2527 2527 1667 1675    1   42 merid  La Perouse Strait