Table 3 Predictor variables for generalized additive models (GAM) of net and gross primary production (NPP, GPP) in Chesapeake Bay.

From: Seasonal to Inter-Annual Variability of Primary Production in Chesapeake Bay: Prospects to Reverse Eutrophication and Change Trophic Classification

Predictor variables

log10 PBopt (net or gross)

log10 euphotic-layer chl-a (or log10 chl-a)

Salinity zone (categorical)

Sea-surface temperature (SST)

Salinity

KPAR or Zp (light attenuation coefficient or euphotic-layer depth)

Month (numerical, 1–12)

Season (categorical)

Year (sequential from start of time-series)

log10 SRF (mean, monthly Susquehanna R. flow)

log10 SUM (cumulative, monthly Susquehanna R. flow)

TN loading (monthly or annual)

NO2 + NO3 loading (monthly or annual)

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