Assessing the utility of frequency dependent nudging for reducing biases in biogeochemical models

摘要: Abstract Bias errors, resulting from inaccurate boundary and forcing conditions, incorrect model parameterization, etc. are a common problem in environmental models including biogeochemical ocean models. While it is important to correct bias errors wherever possible, unlikely that any will ever be entirely free of such errors. Hence, methods for reduction necessary. A widely used technique online nudging, where simulated fields continuously forced toward observations or climatology. Nudging robust easy implement, but suppresses high-frequency variability introduces artificial phase shifts. As solution this Thompson et al. (2006) introduced frequency dependent nudging occurs only prescribed bands, typically centered on the mean annual cycle. They showed method effective eddy resolving circulation Here we add stability term previous form which makes more non-linear biological Then assess utility by first applying simple predator–prey then 1D model. In both cases nudge two bands cycle, how well higher recovered. We evaluate effectiveness comparison conventional find significant improvements with former.