Subdaily meteorological measurements of temperature, direction of the movement of the clouds, and cloud cover in the Late Maunder Minimum by Louis Morin in Paris

• DOI: 10.5194/cp-2021-179
• Publication Date: 2022-01-07T14:11:55Z
• Authors: Thomas Pliemon; Ulrich Foelsche; Christian Rohr; Christian Pfister
• Keywords: Proxy (statistics)

Abstract. We have digitized three meteorological variables (temperature, direction of the movement clouds, and cloud cover) from copies Louis Morin’s original measurements (Source: Institute History / Oeschger Centre for Climate Change Research, University Bern) subjected them to quality analysis make these data available scientific community. Our cover period 1665–1709 (temperature beginning in 1676). compare early instrumental temperature dataset with statistical methods proxy validate terms inhomogeneities claim that they are, apart small inhomogeneities, reliable. The Late Maunder Minimum (LMM) is characterized by cold winters autumns, moderate springs summers, respect reference 1961–1990. Winter months show a significant lower frequency westerly clouds. This reduction advection ocean leads cooling Paris winter. influence becomes apparent when comparing last decade 17th century (cold) first 18th (warm). A clouds can also be seen summer, but stronger winter than summer. Consequently, unusually LMM attributed An impact reveals 1708/09 was devastating one consecutive ice days, although other are more pronounced (e.g., 1676/77, 1678/79, 1683/84, 1692/93, 1694/95 1696/97) mean temperature, 15 days or days. investigation revealed high discrepancy seasons, where season (DJF) (−13.2 %) spring (MAM) (−12.6 negative anomaly total (TCC), whereas summer (JJA) (−0.5 shows TCC 30 year Meteobluedata (1985–2014).