Reply to Stauning's comment on "The PC index: review of methods" by McCreadie and Menvielle (2010)

Lockwood_PCIndex_Final

“…These preliminary PCS data contained some errors that were not corrected in some early publications (Stauning, 2022b(Stauning, , 2022a. Before 2013, IAGA endorsement of the indices was not forthcoming because of concerns that the procedure used was not the same for the two indices (McCreadie & Menvielle, 2010;Stauning, 2013). Although the two were highly correlated, PCN was systematically 35% smaller than PCS and the difference grew when values were high (Lukianova et al, 2002;Ridley & Kihn, 2004).…”

“…The PC indices have been issued from the Arctic and Antarctic Research Institute (AARI) in St. Petersburg, the Danish Meteorological Institute (DMI), and the Danish Space Research Institute (DTU Space) in different versions over the years since the pioneering work ofTroshichev et al (1988). The present paper examines the PCN and PCS data sets that were initially recommended by IAGA in 2013(Menvielle et al, 2013) and …”

Lockwood_PCIndex_R1

“…The data contained some errors that were not corrected in some early publications (Stauning, 2022b(Stauning, , 2022a. Before 2013, IAGA endorsement of the indices was not forthcoming because of concerns that the procedure used was not the same for the two indices (McCreadie & Menvielle, 2010;Stauning, 2013). Although the two were highly correlated, PCN was systematically 35% smaller than PCS and the difference grew when values were high (Lukianova et al, 2002;Ridley & Kihn, 2004).…”