Synthesis of Arctic PP I- Historical data (field 14 C-, chl-derived NPP)
description
Transcript of Synthesis of Arctic PP I- Historical data (field 14 C-, chl-derived NPP)
Synthesis of Arctic PPI- Historical data
(field 14C-, chl-derived NPP)
Paty MatraiElise Olson
Bigelow Laboratory for Ocean SciencesJanuary 28-29, 2008
14C-PP: All data points, all depths, all times
Chl a: All data points, all depths, by season
Surface (0-5m) chl-NPP [mgC m-3 d-1], all years, seasonal
Surface (0-5m) 14C-NPP [mgC m-3 d-1], all years, seasonal
14C-NPP
Chl-NPP
Integrated (0-MLD) chl-NPP [mgC m-2 d-1], all years, seasonal
Integrated (0-MLD) 14C-NPP [mgC m-2 d-1], all years, seasonal
Surface (0-5m) NPP [mgC m-3 d-1], annual, 1954-200514C-NPP Chl-NPP
0.08 - 21.2 gC m-3 a-1 <0.003 – 2.3 gC m-3 a-1
Integrated (0-MLD) NPP [mgC m-2 d-1], annual, 1954-2005
14C-NPP Chl-NPP
0.07 - 304 gC m-2 a-1 0.07 - 304 gC m-2 a-1
Log Chlorophyll (mg m-3)
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0
Lo
g D
aily
PP
(m
g C
m-3
day
-1)
-2
-1
0
1
2
3
4
Resolute BayChukchi BayBarents
1. Empirical chlorophyll based algorithmV. Hill
Combined dataset
ANCOVA
•Chl 0.8 – 32 mg m-3
•P < 0.01
Average Chlorophyll•Resolute Bay 8.1 mg m-3
•Barents Sea 4.2 mg m-3
•Chukchi Sea 1.2 mg m-3
Log PP = 1.36 + 1.0.Log Chl
?
14C-observed vs. chl-derived field NPP
Ob
serv
ed
Calculated
Comparison of Annual Integrated Averages [gC m-2 a-1]
60-70oN 70-80oN 80-90oNGreenland,Norwegian,WSpitzbergen,Chukchi,~Bering
Chukchi,Beaufort ESiberian, Laptev, Kara,Barents,Greenland,Labrador, Canadian A.,
Field 14C-NPP 1954-2005 MLD 108.27 76.49 68.53
Field Chl-NPP 1954-2005 MLD 76.13 21.34 20.69
Sat chl-NPP 1998-2007 Euph 61.36 29.27 13.82
PO4-NCP 1971-2005 26m 16.91 16.34 12.47
NO3-NCP 1971-2005 26m 15.30 15.51 0.50
Total High Arctic Sakshaug 2004
97, >230, 60-180
32, 97 >11
NO3 longer winter 12.15 12.88 2.17
Assumptions: # days growth season, integration depth, geometric mean, #years, daylength, mo. per season, scale up: d-1 -> a-1, C/N, ?
Comparison of Annual Surface Averages
gC m-3 a-1
60-70oN 70-80oN 80-90oN
Field 14C-NPP 1954-2005 7.02 3.38 4.24?
Field Chl-NPP 1954-2005 2.23 1.02 0.84
Sat chl-NPP 1998-2007 2.84 1.36 0.48
Average vertical profiles, 10o latitude bands, annual, 1954-2005
14C-NPP
chl-NPP
0
000
0020
80
20 20
80 80