A Net Primary Productivity Algorithm Round Robin (PPARR) for the Arctic Ocean: A brief introduction to the PPARR 5 adventure Patricia Matrai 1, Yoonjoo.

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Presentation transcript:

A Net Primary Productivity Algorithm Round Robin (PPARR) for the Arctic Ocean: A brief introduction to the PPARR 5 adventure Patricia Matrai 1, Yoonjoo Lee 1, Marjorie Friederichs 2, and Vincent Saba 3 1 Bigelow Laboratory for Ocean Sciences 2 Virginia Institute of Marine Sciences 3 NMFS, NOAA 2 nd FAMOS, WHOI, October 2013,

Previous NASA-funded PPARRs PPARR-3: Ocean color and GCM models; satellite data only PPARR-1, 2: Ocean color models; field data only PPARR-4: Ocean color and GCM models; field and satellite data; spatial or temporal resolution

Three empirical estimates of Arctic annual, regional, integrated PP… Combining in situ PP historical measurements, in situ chlorophyll-derived PP and satellite-derived PP ( ). An arctic-specific empirical algorithm was used for the satellite derivations. Note that the Arctic Basin is separated [Hill et al. 2013]. Satellite-derived PP ( ). A polar algorithm was used for the satellite derivations. Note that the Arctic Basin is included in each of its individual regions [Pabi et al. 2008; Arrigo and Dijken 2011]. Satellite-derived PP ( ). Different algorithms were used for the satellite derivations. [Bélanger et al. 2013]

Changing! Pan-Arctic mean open water area and annual production increasing trends in the Arctic Ocean ( ), estimated from remotely-sensed parameters [Arrigo and Dijken 2011] Regional % change in annual production per year ( ), estimated from remotely-sensed parameters. White, starred numbers indicate a significant change. Blue scale bar indicates depth (m) [Arrigo and Dijken 2011]

An AOMIP/FAMOS experiment: Recent ocean model estimates (and the underlying controls) Mean annual integrated PP estimates from (a-e) 5 models [Popova et al. 2012], (f) a satellite-derived estimate and estimates derived from (g) in situ chlorophyll and (h) satellite-chlorophyll by Hill et al. [2013]. The latter two share the color bar in the lower right (gC/m 2 /yr). Popova et al Hill et al nd FAMOS, WHOI, October 2013, Nutrients? MLD?

ESMs in the Arctic: CMIP5 simulation for 2100 Ice Integrated PP Surf. NO 3 (2013) Stratification index -> NO 3 2nd FAMOS, WHOI, October 2013,

PPARR-5 Arctic Ocean Strategy Compilation, quality control, and characterization of field and remotely-sensed data: Now Over the next 2 years: 0-D and 1-D biological or biogeochemical; ocean color; phys-biol coupled ocean; GCM; ESM models to be invited Statistical analyses of the observed and modeled NPP Feedback and iterations with the modelers on model performance Inter-model comparisons of Arctic NPP historical and future projections 2 nd FAMOS, WHOI, October 2013,

Ah! An appeal for data… ARCSS-PP: Spatial and seasonal distribution of in situ data of chlorophyll a (Chl) and PP data in the Arctic Ocean, Color scale indicates the number of data points in each grid cell [Matrai et al. 2013]. Also ARCSS-NUT for nutrients [Codispoti et al. 2013]. Since 2007, additional data available from or collected by CASES, CFL, Korean expeditions, Chinese expeditions, ATOS-1, MALINA, ICESCAPES, NAACOS, ??? Let us know! 2nd FAMOS, WHOI, October 2013,

Special Arctic Ocean issues for PPARR, or not… Profiles of mean in situ Chl-a and PP as a function of optical depth with 1 standard error bars (A-F). Profiles of PP also shown as regional averages as a function of depth [H-J] for spring, summer and fall data in the ARCSS-PP data set. Only ARCSS-PP data with matching Chl-a and PP measurements are plotted. >60% ice cover 30-60% ice cover <30% ice cover Hill et al Arrigo & Dijken 2011 Ardyna et al nd FAMOS, WHOI, October 2013,

Building from PPARR-4: Understanding NPP simulations Saba et al nd FAMOS, WHOI, October 2013,

PPARR-5 Arctic Ocean Strategy 0-d and 1-d biological and biogeochemical; ocean color; phys-biol coupled ocean; GCM; ESM models are invited Open to new questions arising from FAMOS discussions Please contact Yoonjoo Lee or Paty Matrai for details. We’ll contact you in early 2014!