Interannual variability of Alexandrium fundyense abundance ...
Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux
description
Transcript of Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux
![Page 1: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/1.jpg)
Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO2
FluxS. Doney & Ivan Lima (WHOI), K. Lindsay & N. Mahowald (NCAR), K. Moore (UCI) & Matt Maltrud
(LANL)Global Ocean Hindcast Simulations (1958-
2004)-Upper ocean multi-functional group, multi-nutrient ecosystem model (Moore et al., 2004) -Coupled to full-depth ocean BGC model (CCSM-POP)-Surface forcing (1957-2004) from NCEP reanalysis and satellite products-Fixed pre-industrial atmospheric CO2 (~280 ppm) & transient anthropogenic CO2 simulations
![Page 2: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/2.jpg)
Physical & Biological Controls
pCO2 = f(Temp., Salinity, DIC, Alkalinity) + (+) + -
Net Community Prod.
Winter mixed layer
Circulation
Light
Nutrient/DIC Supply
Export
Winds, Heat & Freshwater Fluxes Dust/iron CO2 O2
Remineralization
Regenerated Prod.
Biology only one factor on surface pCO2 & air-sea CO2 flux;
![Page 3: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/3.jpg)
QuickTime™ and aYUV420 codec decompressor
are needed to see this picture.
![Page 4: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/4.jpg)
Ocean Model Hindcast (1957-2004)
![Page 5: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/5.jpg)
€
′ F CO2 = ′ k < ΔpCO2 > + < k > ΔpC ′ O 2
Factors driving interannual pCO2 anomalies: Wind Speed
![Page 6: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/6.jpg)
Alk
TempnDIC
Freshwater
W. Eq. Pacific
1:1
€
pC ′ O 2 =∂pCO2
∂T′ T +
∂pCO2
∂DICnDI ′ C +
∂pCO2
∂AlknAl ′ k +
∂pCO2
∂S(DIC ,ALK ,s)
′ S
![Page 7: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/7.jpg)
Regression of surface pCO2 anomalies on forcing terms
~1 driving term 0 minor term<0 compensating term
Masked in areas of low pCO2’ and low correlation
Dissolved Inorganic Carbon
Temperature
![Page 8: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/8.jpg)
Alkalinity
Freshwater
Regression of surface pCO2 anomalies on forcing terms
~1 driving term 0 minor term<0 compensating term
Masked in areas of low pCO2’ and low correlation
![Page 9: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/9.jpg)
Q’
I
A’
V’
E’
0
100
Annual inventory change & flux anomalies X’:I/t = Q’ srf. flux + A’ horz. advection + E’ eddies + V’ vert. adv. + P’ net comm. prod. + other P’
![Page 10: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/10.jpg)
Dust Only
Dust Only
Physics Only
Physics Only
![Page 11: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/11.jpg)
Dust & Physicsr=0.48
SeaWiFS
Physicsr=0.11
Dustr=0.82
Smoothed w/annual filter
![Page 12: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/12.jpg)
Monthly
Annual
![Page 13: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/13.jpg)
-Models as tools for identifying ocean biogeochemical mechanisms-Regional partitioning of factors driving air-sea CO2 flux
•Southern Ocean wind speed variability •Subtropics thermal•Tropics/high latitude biology and circulation on nDIC•Tropical Indo-Pacific freshwater
-Non-linear interactions of dust and climate variability
![Page 14: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/14.jpg)
![Page 15: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/15.jpg)
![Page 16: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/16.jpg)
Is low dust deposition downwind of Australia in 1997/1998 realistic? Tentative answer: yes
Chen et al. precip slightly above average for 1997 and 1998
All values are anomalies from climatological mean (1979-2004): black monthly: Yellow line: 0: blue line: annual mean
Two met stations close to source area: 946720 and 944820 have fewer dust events than average in 1997 and 1998
Low dep due to low source
Low dep due to high precip
Model Obs
![Page 17: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/17.jpg)
Dust & Physicsr=0.60
SeaWiFS
Physicsr=0.56
Dustr=0.71
Monthly anomalies
![Page 18: Quantifying the Mechanisms Governing Interannual Variability in Air-sea CO 2 Flux](https://reader035.fdocuments.net/reader035/viewer/2022062803/568148d3550346895db5efc7/html5/thumbnails/18.jpg)