Unexpected fix for ocean models

Evolution: A Fixed-Nitrogen Fix in the Early Ocean?

A new study asserts that a late evolutionary leap in cyanobacterial nitrogen fixation terminated a long history of nitrogen-limited primary production in the ocean--and contributed to a dramatic increase in biospheric oxygen coincident with the rise of animals.

a new approach to credibility premium for zero-inflated poisson models for panel data

هدف اصلی از این تحقیق به دست آوردن و مقایسه حق بیمه باورمندی در مدل های شمارشی گزارش نشده برای داده های طولی می باشد. در این تحقیق حق بیمه های پبش گویی بر اساس توابع ضرر مربع خطا و نمایی محاسبه شده و با هم مقایسه می شود. تمایل به گرفتن پاداش و جایزه یکی از دلایل مهم برای گزارش ندادن تصادفات می باشد و افراد برای استفاده از تخفیف اغلب از گزارش تصادفات با هزینه پائین خودداری می کنند، در این تحقیق ...

Fundamentals of Ocean Climate Models Fundamentals of Ocean Climate Models

SPMD OpenMP vs MPI for Ocean Models

Two ocean models, NLOM and NCOM (NRL Layered and Coastal Ocean Models), use domain decomposition to obtain scalability that has been demonstrated on up to 1,152 nodes (Wallcraft and Moore, 1997; Parallel Comp.). In both models, communication between nodes is for the most part performed by calling an application specific programming interface (ASPI), i.e. a set of Fortran subroutines that perfor...

Hydrostatic correction for sigma coordinate ocean models

[1] How to reduce the horizontal pressure gradient error is a key issue in terrain-following coastal models. The horizontal pressure gradient splits into two parts, and incomplete cancellation of the truncation errors of those parts cause the error. Use of the finite volume discretization leads to a conserved scheme for pressure gradient computation that has better truncation properties with hi...