TY - GEN AU - L. Isaksen AU - Mike Fisher AU - Erik Andersson BT - ECMWF Technical Memoranda CY - Shinfield Park, Reading DA - 08/2004 DO - 10.21957/rpuh89jd LA - eng M1 - 445 PB - ECMWF PP - Shinfield Park, Reading PY - 2004 EP - 23 T2 - ECMWF Technical Memoranda TI - The structure and realism of sensitivity perturbations and their interpretation as 'Key Analysis Errors'. UR - https://www.ecmwf.int/node/10126 ER -