Patterns of nitrate utilization and new production over the Bering-Chukchi shelf

Nutrients and primary production along the eastern Aleutian Island Archipelago

“…However, in the eastern passes, our averaged daily June production rates were 2-17 times higher than those reported by McRoy et al In a recent overview of production estimates in the Aleutians and Bering Sea, Springer et al (1996) provided very general annual production rates of 150-200 g C m )2 yr )1 across the entire Aleutian Island Archipelago. Assuming a 4-month growing season (Hansell et al, 1993), averaged daily production rates for Springer et al, (1996) were 1230-1640 mg C m )2 day )1 , results similar to the average production found in this study (1510 ± 120 mg C m )2 day )1 ). However, we also found that primary production rates varied widely (40 ± 30-6810 ± 920 mg C m )2 day )1 ), spanning far beyond the generalized rates given by Springer et al (1996).…”

Nutrients and primary production along the eastern Aleutian Island Archipelago

“…However, in the eastern passes, our averaged daily June production rates were 2-17 times higher than those reported by McRoy et al In a recent overview of production estimates in the Aleutians and Bering Sea, Springer et al (1996) provided very general annual production rates of 150-200 g C m )2 yr )1 across the entire Aleutian Island Archipelago. Assuming a 4-month growing season (Hansell et al, 1993), averaged daily production rates for Springer et al, (1996) were 1230-1640 mg C m )2 day )1 , results similar to the average production found in this study (1510 ± 120 mg C m )2 day )1 ). However, we also found that primary production rates varied widely (40 ± 30-6810 ± 920 mg C m )2 day )1 ), spanning far beyond the generalized rates given by Springer et al (1996).…”

A reassessment of primary production and environmental change in the Bering Sea

“…In part, this is because our regions of interest, as we have defined them, include both the productive plume and adjacent relatively unproductive waters (Figure 12a). Yet even within the Anadyr plume itself, the mean rates of NPP we calculate are only ∼220 g C m −2 yr −1 , a value that is two‐ to threefold lower than previous estimates [ Sambrotto et al , 1984; Springer and McRoy , 1993; Hansell et al , 1993] (Figure 12a and Table 5). A recent study by Lee et al [2007] also describes much lower rates of primary production within the plume of Anadyr water in the Chukchi Sea (145 g C m −2 yr −1 ).…”

“…By far the largest discrepancies with historical estimates come in northern reaches of the Green Belt. Although the plume of highly productive Anadyr Water described by Sambrotto et al [1984], Springer and McRoy [1993], and Hansell et al [1993] is clearly visible (Figure 12a), we observed much lower rates of annual NPP for the Gulf of Anadyr and Chirikov Basin than these earlier studies (Table 5). In part, this is because our regions of interest, as we have defined them, include both the productive plume and adjacent relatively unproductive waters (Figure 12a).…”

“…The possibility of a reduced, highly variable NPP regime in the Green Belt region is supported by recent studies of the eastern shelf break [ Rho and Whitledge , 2007] and Anadyr Stream [ Lee et al , 2007]. Although our annual rates of NPP in the Green Belt are lower than many historical studies, the Green Belt is a feature of our climatological map of NPP (Figure 12a), and with so many historical descriptions of its prodigious production, there can be no doubt of its importance [ Saino et al , 1979; Goering and Iverson , 1981; Hansell et al , 1993; Springer et al , 1996; Springer , 1999; Mathis et al , 2010]. Yet, our historical understanding of the Bering Sea appears to have been unduly influenced by this relatively small ribbon of enhanced productivity.…”

Late summer/early fall phytoplankton biomass (chlorophyll a) in the eastern Bering Sea: Spatial and temporal variations and factors affecting chlorophyll a concentrations

“…Goering and Iverson, 1981;Brown et al, 2011;Lomas et al, 2012;Moran et al, 2012;). Similarly, primary production has been shown to decrease from offshore to onshore on the southern shelf (e.g., Hansell et al, 1993;Springer et al, 1996;Lomas et al, 2012). High Chla along the shelf break, as observed for our single shelf-break station (Fig.…”

Nutrients and primary production along the eastern Aleutian Island Archipelago

“…However, in the eastern passes, our averaged daily June production rates were 2-17 times higher than those reported by McRoy et al In a recent overview of production estimates in the Aleutians and Bering Sea, Springer et al (1996) provided very general annual production rates of 150-200 g C m )2 yr )1 across the entire Aleutian Island Archipelago. Assuming a 4-month growing season (Hansell et al, 1993), averaged daily production rates for Springer et al, (1996) were 1230-1640 mg C m )2 day )1 , results similar to the average production found in this study (1510 ± 120 mg C m )2 day )1 ). However, we also found that primary production rates varied widely (40 ± 30-6810 ± 920 mg C m )2 day )1 ), spanning far beyond the generalized rates given by Springer et al (1996).…”

A reassessment of primary production and environmental change in the Bering Sea

“…In part, this is because our regions of interest, as we have defined them, include both the productive plume and adjacent relatively unproductive waters (Figure 12a). Yet even within the Anadyr plume itself, the mean rates of NPP we calculate are only ∼220 g C m −2 yr −1 , a value that is two‐ to threefold lower than previous estimates [ Sambrotto et al , 1984; Springer and McRoy , 1993; Hansell et al , 1993] (Figure 12a and Table 5). A recent study by Lee et al [2007] also describes much lower rates of primary production within the plume of Anadyr water in the Chukchi Sea (145 g C m −2 yr −1 ).…”

“…By far the largest discrepancies with historical estimates come in northern reaches of the Green Belt. Although the plume of highly productive Anadyr Water described by Sambrotto et al [1984], Springer and McRoy [1993], and Hansell et al [1993] is clearly visible (Figure 12a), we observed much lower rates of annual NPP for the Gulf of Anadyr and Chirikov Basin than these earlier studies (Table 5). In part, this is because our regions of interest, as we have defined them, include both the productive plume and adjacent relatively unproductive waters (Figure 12a).…”

“…The possibility of a reduced, highly variable NPP regime in the Green Belt region is supported by recent studies of the eastern shelf break [ Rho and Whitledge , 2007] and Anadyr Stream [ Lee et al , 2007]. Although our annual rates of NPP in the Green Belt are lower than many historical studies, the Green Belt is a feature of our climatological map of NPP (Figure 12a), and with so many historical descriptions of its prodigious production, there can be no doubt of its importance [ Saino et al , 1979; Goering and Iverson , 1981; Hansell et al , 1993; Springer et al , 1996; Springer , 1999; Mathis et al , 2010]. Yet, our historical understanding of the Bering Sea appears to have been unduly influenced by this relatively small ribbon of enhanced productivity.…”

Late summer/early fall phytoplankton biomass (chlorophyll a) in the eastern Bering Sea: Spatial and temporal variations and factors affecting chlorophyll a concentrations

“…Goering and Iverson, 1981;Brown et al, 2011;Lomas et al, 2012;Moran et al, 2012;). Similarly, primary production has been shown to decrease from offshore to onshore on the southern shelf (e.g., Hansell et al, 1993;Springer et al, 1996;Lomas et al, 2012). High Chla along the shelf break, as observed for our single shelf-break station (Fig.…”

Nutrients and primary production along the eastern Aleutian Island Archipelago

“…However, in the eastern passes, our averaged daily June production rates were 2-17 times higher than those reported by McRoy et al In a recent overview of production estimates in the Aleutians and Bering Sea, Springer et al (1996) provided very general annual production rates of 150-200 g C m )2 yr )1 across the entire Aleutian Island Archipelago. Assuming a 4-month growing season (Hansell et al, 1993), averaged daily production rates for Springer et al, (1996) were 1230-1640 mg C m )2 day )1 , results similar to the average production found in this study (1510 ± 120 mg C m )2 day )1 ). However, we also found that primary production rates varied widely (40 ± 30-6810 ± 920 mg C m )2 day )1 ), spanning far beyond the generalized rates given by Springer et al (1996).…”

A reassessment of primary production and environmental change in the Bering Sea

“…In part, this is because our regions of interest, as we have defined them, include both the productive plume and adjacent relatively unproductive waters (Figure 12a). Yet even within the Anadyr plume itself, the mean rates of NPP we calculate are only ∼220 g C m −2 yr −1 , a value that is two‐ to threefold lower than previous estimates [ Sambrotto et al , 1984; Springer and McRoy , 1993; Hansell et al , 1993] (Figure 12a and Table 5). A recent study by Lee et al [2007] also describes much lower rates of primary production within the plume of Anadyr water in the Chukchi Sea (145 g C m −2 yr −1 ).…”

“…By far the largest discrepancies with historical estimates come in northern reaches of the Green Belt. Although the plume of highly productive Anadyr Water described by Sambrotto et al [1984], Springer and McRoy [1993], and Hansell et al [1993] is clearly visible (Figure 12a), we observed much lower rates of annual NPP for the Gulf of Anadyr and Chirikov Basin than these earlier studies (Table 5). In part, this is because our regions of interest, as we have defined them, include both the productive plume and adjacent relatively unproductive waters (Figure 12a).…”

“…The possibility of a reduced, highly variable NPP regime in the Green Belt region is supported by recent studies of the eastern shelf break [ Rho and Whitledge , 2007] and Anadyr Stream [ Lee et al , 2007]. Although our annual rates of NPP in the Green Belt are lower than many historical studies, the Green Belt is a feature of our climatological map of NPP (Figure 12a), and with so many historical descriptions of its prodigious production, there can be no doubt of its importance [ Saino et al , 1979; Goering and Iverson , 1981; Hansell et al , 1993; Springer et al , 1996; Springer , 1999; Mathis et al , 2010]. Yet, our historical understanding of the Bering Sea appears to have been unduly influenced by this relatively small ribbon of enhanced productivity.…”

Late summer/early fall phytoplankton biomass (chlorophyll a) in the eastern Bering Sea: Spatial and temporal variations and factors affecting chlorophyll a concentrations

“…Goering and Iverson, 1981;Brown et al, 2011;Lomas et al, 2012;Moran et al, 2012;). Similarly, primary production has been shown to decrease from offshore to onshore on the southern shelf (e.g., Hansell et al, 1993;Springer et al, 1996;Lomas et al, 2012). High Chla along the shelf break, as observed for our single shelf-break station (Fig.…”