Qualitycontrol, archivingand retrieving Swedish data Historical data

Lennart Wern Qualitycontrol, archivingand retrieving Swedish data Historical data lennart.wern@smhi.se

Experiences from Sweden Quality control is very important. It is easy to find errors in the data base Found errors in the data base must always be corrected It is time consuming to find the correct value Encourage all users to report wrong values, so they can be corrected Homogenity test shows outliers No automatic changes of values in the data base Maybe data from UERRA can be used for QC

Compare values Highest daily in Sweden Month Daily precipitation Station County Date Jan 104,3 mm Katterjåkk Lappland 2002-01-10 Feb 85,2 mm Joesjö Lappland 1976-02-16 Mar 90,0 mm Joesjö Lappland 1966-03-19 Apr 78,0 mm Härnösand Ångermanland 1959-04-08 Maj 93,0 mm Öxabäck Västergötland 1931-05-27 Jun 187,3 mm Härnösand Ångermanland 1908-06-18 Jul 198,0 mm Fagerheden Norrbotten Highest 1997-07-28 daily in Sweden in the database Aug 188,6 mm Råda Värmland 2004-08-04 Daily Sep 141,0 mm Hemse Gotland 1913-09-02 Month precipitation Station Id Date Okt 126,8 mm Söderhamn Hälsingland 1992-10-15 jan 104.3 Katterjåkk 188820 2002-01-10 Nov 82,9 mm Ryningsnäs Småland 1910-11-12 feb 85.2 Joesjö 154920 1976-02-16 Dec 121,8 mm Riksgränsen Lappland 1909-12-14 mar 90.0 Joesjö 154920 1966-03-19 apr 78.0 Härnösand 127380 1959-04-08 maj 89.2 Borgvattnet 135260 1988-05-30 jun 121.5 Gunnebo 76430 1959-06-29 jul 198.0 Fagerheden 160800 1997-07-28 aug 188.6 Råda 103000 2004-08-04 sep 111.9 Ystad 53260 2000-09-02 okt 126.8 Söderhamn 117160 1992-10-15 nov 81.2 Nianfors 116360 1981-11-23 dec 89.2 Bredbyn D 138270 2011-12-09

Youneedtofindthe correctvalue

Always correct wrong values in the data base No values is removed in the database. A new value with a later version is added

Highest daily minimum temperature in the database Id Station Year Date jan Date feb Date mar Date Start Slut Antal 52230 Falsterbo 22.3 19970826 7.6 20070110 6.7 19900221 7.0 19900324 19510101 20170701 24258 52240 Falsterbo A 20.6 20140729 6.1 20140108 5.4 20160202 6.4 20140317 20090701 20170701 2923 52350 Malmö Aut 21.8 19940729 8.1 20070110 8.0 19900221 7.8 19900322 19900101 20170701 9975 52360 Oskarsgrundet No 22.9 19970825 6.8 19880103 7.1 19900208 7.3 19900322 19850501 19990617 4650 52510 Örja Aut 19.9 19880609 7.3 19890116 8.7 19890207 7.7 19900322 19860708 19921208 2271 52550 Ven 18.8 19750810 6.5 19750106 5.0 19740222 5.7 19680328 19630101 19820630 6746 52560 Hilleshög 13.5 19620721 19620701 19620731 31 52620 Weibullsholm 19.0 19630725 4.5 19650117 4.2 19660206 4.2 19650330 19620701 19661231 1636 52660 Säbyholm 19.4 19660708 4.1 19620118 5.4 19610227 7.1 19670309 19610101 19690824 3082 53180 Rynge V 21.1 19970825 8.0 20070110 6.9 19980215 7.2 20040317 19960319 20151231 6868 53200 Smygehuk 19.6 19730707 5.7 19880103 4.2 19730207 5.5 19610316 19510101 19880605 13388 53220 Maglarp Aut 18.7 19870630 6.4 19890131 6.9 19890207 6.9 19890328 19860901 19951017 1498 53230 Trelleborg 19.2 19690730 5.5 19710124 3.9 19670204 5.5 19670322 19660709 19710930 1849 53250 Jordberga 19.4 19630803 5.0 19740119 4.7 19740211 6.2 19610316 19610101 19741231 5113

Highest and lowest every year Absolute maximum temperature in the database Year Month Day [ C] klimnr Station 1945 7 17 35.0 85600 Adelsnäs 1946 7 5 29.0 53770 Arlöv sockerbruk 1947 6 30 34.5 53770 Arlöv sockerbruk 1948 8 3 33.0 53770 Arlöv sockerbruk 1949 6 8 27.1 74600 Aneboda II 1950 6 5 27.5 97630 Aske 1951 7 11 29.1 53650 Björka 1952 7 10 32.3 117160 Söderhamn 1953 6 30 33.7 53650 Björka 1954 6 21 31.3 53650 Björka 1955 7 15 32.6 97200 Stockholm-Bromma 1956 6 9 30.7 97200 Stockholm-Bromma 1957 6 17 31.2 75040 Allgunnen 1958 7 2 31.0 127380 Härnösand Absolute minimum temperature in the database Winter Month Day [ C] klimnr Station 1944/1945 1 31-24.5 85600 Adelsnäs 1945/1946 3 16-24.0 98610 Berga 1946/1947 2 26-23.5 98610 Berga 1947/1948 2 24-11.9 53770 Arlöv sockerbruk 1948/1949 12 25-6.0 53770 Arlöv sockerbruk 1949/1950 3 14-21.0 74600 Aneboda II 1950/1951 2 15-40.0 169880 Jokkmokk 1951/1952 3 2-37.0 192830 Karesuando 1952/1953 2 5-40.8 183760 Pajala 1953/1954 1 23-37.0 113410 Särna 1954/1955 2 19-40.0 159970 Suddesjaur 1955/1956 1 31-46.2 159970 Suddesjaur 1956/1957 3 20-38.6 159970 Suddesjaur 1957/1958 1 9-44.8 159970 Suddesjaur 1958/1959 1 21-44.2 159970 Suddesjaur 1959/1960 1 19-40.2 167710 Arjeplog 1960/1961 2 6-41.3 181900 Vittangi 1961/1962 3 8-40.0 161660 Brännbergs försöksgård 1962/1963 2 18-43.4 192830 Karesuando 1963/1964 2 12-39.9 166810 Jäckvik 1964/1965 1 11-44.0 189780 Kattuvuoma 1965/1966 2 2-52.6 166870 Vuoggatjålme 1966/1967 1 29-46.8 166870 Vuoggatjålme 1967/1968 12 22-43.0 166870 Vuoggatjålme

Geostrophic wind

Geostrophic wind Triangle method Long trends of wind speed Pressure is more homogenous than wind speed Pressure since 1879, 3 observations per day L 971.6 hpa 978.5 hpa Göteborg 53 m/s Visby 260 993.8 hpa Lund Wind storm Gudrun 8 jan 2005, 18 UTC 9

Triangles 1940 (1939) - 2016 1 2 1879-2016 10

Numberofstations in the data basewith pressure 11

Check 1939-2016 yyyy-mm-dd hh:mm [km] Obs Interpol Klimnr Station 1939-03-28 13:00 0 1024.7 1020.1 97200 Stockholm-Bromma 1939-03-28 13:00 68 1019.9 87450 Landsort 1939-03-28 13:00 129 1019.1 89240 Gotska Sandön 1939-03-28 13:00 152 1023.3 95620 Örebro 1939-03-28 13:00 175 1018.9 85240 Malmslätt 1939-03-28 13:00 191 1017.1 76470 Västervik 1939-03-28 13:00 192 1028.3 105370 Falun 1939-03-28 13:00 192 1017.2 78390 Visby 1939-03-28 13:00 227 1015.4 77220 Ölands Norra Udde 1939-03-28 13:00 250 1026.3 103090 Gustavsfors 1939-03-28 13:00 271 1014.9 68550 Hoburg What does the paper journal say? How does the isobar computer analysis look like? How does the analysis in the archive look like? 12

Comparison Observed with interpolated Karesuando Stockholm-Bromma 13

Data set 20CR, start 1900 Stockholm Obsat 20CR Stockholm 9 hpa 20CR 14

QC before 1940 Looked at the old weather analys Tried Compare high geostrophic wind speed with sea level, no success Pressure from Norway, not much data before 1957 Future work Wait for more pressure data to be digitized

Average Triangel 2 Triangel 1 16

>= 25 m/s Triangel 2 Triangel 1 17

Download data

http://opendata-download-metobs.smhi.se/explore/

Stationsnamn Klimatnummer Mäthöjd (meter över marken) Norrköping-SMHI 86340 2 Parameternamn Beskrivning Enhet Lufttemperatur min, 1 gång per dygn degree celsius Lufttemperatur max, 1 gång per dygn degree celsius Tidsperiod (fr.o.m) Tidsperiod (t.o.m) Höjd (meter över havet) Latitud (decimalgrader) Longitud (decimalgrader) 1993-04-28 00:00 2013-08-04 23:59 21 58.5833 16.15 2013-08-05 00:00 2017-09-30 23:59 40.2 58.58283 16.147 Från Datum Tid (UTC) Till Datum Tid (UTC) Representativt dygn Lufttemperatur Kvalitet Lufttemperatur Kvalitet 1993-04-28 18:00 1993-04-29 18:00 1993-04-29 0.9 G 14.8 G 1993-04-29 18:00 1993-04-30 18:00 1993-04-30 1.3 G 18.3 G 1993-04-30 18:00 1993-05-01 18:00 1993-05-01 0 G 18 G 1993-05-01 18:00 1993-05-02 18:00 1993-05-02 5 G 21.5 G 1993-05-02 18:00 1993-05-03 18:00 1993-05-03 2 G 21 G 1993-05-03 18:00 1993-05-04 18:00 1993-05-04 6 G 16.5 G 1993-05-04 18:00 1993-05-05 18:00 1993-05-05-0.5 G 14 G 1993-05-05 18:00 1993-05-06 18:00 1993-05-06 5 G 15.6 G 1993-05-06 18:00 1993-05-07 18:00 1993-05-07 5.5 G 24.1 G 1993-05-07 18:00 1993-05-08 18:00 1993-05-08 7.4 G 20 G 1993-05-08 18:00 1993-05-09 18:00 1993-05-09 9.6 G 19.2 G 1993-05-09 18:00 1993-05-10 18:00 1993-05-10 3.2 G 20 G 1993-05-10 18:00 1993-05-11 18:00 1993-05-11 3.8 G 21.5 G 1993-05-11 18:00 1993-05-12 18:00 1993-05-12 4.1 G 23.4 G

Thank you