ComparisonCi off earlyl upper‐airi observationsbti iin ChiChina andd KKorea withith ththe TtithTwentieth CtCentury andd ERA‐20C0 reanalysesea al yses Alexander Stickler1,212, Richard Wartenburger1,2*1,212*, and Stefan Brönnimann1,212 1OhOeschger CCentre ffor CliClimate ChChange RhResearchResearch, BBernBern, SiSwitzerland l d 2IInstInst. off GhGeographyGeography, UiUnivUniv. BBernBern, SiSwitzerland l d *now at IInstInst. off AhiAtmospheric andd ClimateCli Science,SiScience ETH ZürichZü i h (
[email protected],alexander stickler@giub unibe ch Phone: +41 31 631 88 43) 11. IdiIntroduction 33. Reanalyses Fig. 2: Photo‐ IIn ththe fkframework off ththe EU FP7 projectpjjt ERA‐ graphyh off SSven 20CR (Compo et alal., 2011) and ERA‐20C (Poli et alal., 2013) are Hedin (1865‐ datasets totally independent from any upper‐air observations CLIM, hithhitherto t unavailableil bl earlyly upperpp ‐airi 1930 1935 1952), leader off that are based on the assimilation of surface observations only observationsobsebti at o s ffromo ChiChinaCa andadd KKoreaoeahhaveae bbeenbee several expedi‐ didigitised iti d. ThThese encompass ttwo kitkite recordsd tions to central (synoptic pressure (FigFig. 3)), hurricane trackstracks, plus marine winds for ffrom ththe SiSino‐SdihSwedish EExpedition diti 1931/32 iin AiAsia bbetween ERA‐20C) into a numerical weather modelmodel, using monthly sea ththe bdborder regioni off ChiChina andd MliMongolia 1890 and 1935, surface temperature and sea ice as boundary conditionsconditions. HereHere, we (EdEdsen‐GlGol, IkIkengüng ü , totall 217 profiles;fil amongst them use the 20CR ensemble mean and the ERA‐20C “bestbest guess”guess runrun, a ththe SiSino‐SSwe‐ 1942 1945 single model runrun. HdHaude, 1940)1940), threeh pilotil bllballoon, one kikite dish Scientific andd one aircraftif recordd ffrom theh earlyl 19301930s Expedition to FiFig.