Insights about the hybrid error covariance models

Abstract

<p>Hybrid error covariance models construct the covariance matrix to be used in variational data assimilation methods through a linear combination <strong>P^h</strong>= <span>&#945;_c</span><strong>P^c</strong><span>&#160;</span>+ <span>&#945;_e</span><strong>P^l</strong>of the climatological error covariance matrix <strong>P</strong>^{<span>c </span>}and the localized ensemble covariance matrix <strong>P^l</strong>=..