# SH ice area from <a href="https://nsidc.org/data/seaice_index">NSIDC Sea Ice Index v3.0</a>
# file :: ./data/iS_ice_area.dat
# description :: SH seaice area
# scripturl01 :: http://climexp.knmi.nl/getindices.cgi?STATION=SH_seaice_area&TYPE=i&WMO=NSIDCData/S_ice_area&id=diagnose@knmi.nl
# institution :: KNMI Climate Explorer and NSIDC
# source :: https://nsidc.org/data/seaice_index
# source_url :: ftp://sidads.colorado.edu/DATASETS/NOAA/G02135/south/monthly/data/
# comment :: 
# history ::  2025-06-15 12:10:47 ./bin/plotdat anomal ./data/iS_ice_area.dat\n 2025-06-15 12:10:47 dat2nc ./data/iS_ice_area.dat i SH_seaice_area ./data/iS_ice_area.nc\nretrieved from NSIDC and converted 2021-10-04 12:17:56
# ice_area [million km^2] integrated  sea ice concentration
 1978.8334  0.704641E-01
 1978.9166  0.904760E-01
 1979.0000  0.197619    
 1979.0834  0.122325    
 1979.1666 -0.244186E-01
 1979.2500  0.409070    
 1979.3334  0.445117    
 1979.4166  0.651628    
 1979.5000  0.462790    
 1979.5834 -0.369070    
 1979.6666 -0.300233    
 1979.7500 -0.359526    
 1979.8334 -0.299536    
 1979.9166 -0.639524    
 1980.0000 -0.192381    
 1980.0834 -0.137674    
 1980.1666 -0.574419    
 1980.2500  -1.36093    
 1980.3334  -1.41488    
 1980.4166 -0.988372    
 1980.5000 -0.617209    
 1980.5834 -0.199070    
 1980.6666  0.279767    
 1980.7500  0.490474    
 1980.8334  0.220465    
 1980.9166 -0.319524    
 1981.0000 -0.432381    
 1981.0834 -0.247674    
 1981.1666 -0.524419    
 1981.2500 -0.970930    
 1981.3334 -0.774883    
 1981.4166 -0.408372    
 1981.5000 -0.172100E-01
 1981.5834  0.929832E-03
 1981.6666  0.189767    
 1981.7500  0.350474    
 1981.8334  0.450464    
 1981.9166  0.140476    
 1982.0000 -0.223811E-01
 1982.0834 -0.127674    
 1982.1666  0.155581    
 1982.2500  0.749070    
 1982.3334  0.415118    
 1982.4166 -0.683718E-01
 1982.5000 -0.327209    
 1982.5834  0.120930    
 1982.6666 -0.602331E-01
 1982.7500 -0.339526    
 1982.8334 -0.349535    
 1982.9166 -0.569524    
 1983.0000 -0.623810E-01
 1983.0834 -0.776745E-01
 1983.1666 -0.644188E-01
 1983.2500 -0.340930    
 1983.3334 -0.694883    
 1983.4166 -0.798371    
 1983.5000 -0.427210    
 1983.5834 -0.319070    
 1983.6666  0.897675E-01
 1983.7500 -0.159526    
 1983.8334 -0.495358E-01
 1983.9166 -0.169524    
 1984.0000 -0.342381    
 1984.0834 -0.237674    
 1984.1666 -0.344419    
 1984.2500 -0.510930    
 1984.3334 -0.444883    
 1984.4166  0.716286E-01
 1984.5000  0.582790    
 1984.5834  0.709295E-01
 1984.6666 -0.320232    
 1984.7500 -0.349526    
 1984.8334  0.440465    
 1984.9166  0.804763E-01
 1985.0000 -0.402381    
 1985.0834 -0.157674    
 1985.1666 -0.144419    
 1985.2500 -0.300930    
 1985.3334 -0.148826E-01
 1985.4166 -0.583715E-01
 1985.5000 -0.317210    
 1985.5834  0.809298E-01
 1985.6666  0.129767    
 1985.7500  0.290474    
 1985.8334  0.720465    
 1985.9166  0.580476    
 1986.0000  0.157619    
 1986.0834  0.123255E-01
 1986.1666 -0.304419    
 1986.2500 -0.480930    
 1986.3334 -0.814883    
 1986.4166 -0.848372    
 1986.5000 -0.707210    
 1986.5834 -0.699070    
 1986.6666 -0.710233    
 1986.7500 -0.759526    
 1986.8334 -0.749536    
 1986.9166 -0.389524    
 1987.0000  0.376189E-01
 1987.0834  0.123255E-01
 1987.1666  0.655813E-01
 1987.2500 -0.929832E-03
 1987.3334 -0.324883    
 1987.4166 -0.658372    
 1987.5000 -0.297210    
 1987.5834 -0.139070    
 1987.6666 -0.320232    
 1987.7500 -0.369526    
 1987.8334 -0.389536    

 1988.0834 -0.876745E-01
 1988.1666 -0.944188E-01
 1988.2500 -0.600930    
 1988.3334 -0.624883    
 1988.4166 -0.288372    
 1988.5000 -0.177210    
 1988.5834 -0.179070    
 1988.6666 -0.390233    
 1988.7500  0.330474    
 1988.8334  0.670465    
 1988.9166  0.520476    
 1989.0000 -0.102381    
 1989.0834  0.423255E-01
 1989.1666 -0.944188E-01
 1989.2500 -0.540930    
 1989.3334  0.145117    
 1989.4166  0.241629    
 1989.5000 -0.217210    
 1989.5834 -0.129070    
 1989.6666 -0.110233    
 1989.7500 -0.229526    
 1989.8334 -0.199535    
 1989.9166 -0.179524    
 1990.0000  0.117619    
 1990.0834  0.222326    
 1990.1666  0.105581    
 1990.2500  0.139070    
 1990.3334 -0.394883    
 1990.4166 -0.218371    
 1990.5000 -0.527209    
 1990.5834 -0.129070    
 1990.6666 -0.200233    
 1990.7500 -0.279526    
 1990.8334 -0.269535    
 1990.9166 -0.149524    
 1991.0000  0.247619    
 1991.0834  0.102325    
 1991.1666 -0.344186E-01
 1991.2500  0.139070    
 1991.3334  0.511742E-02
 1991.4166 -0.578372    
 1991.5000 -0.577209    
 1991.5834 -0.109070    
 1991.6666 -0.120233    
 1991.7500 -0.279526    
 1991.8334 -0.159535    
 1991.9166 -0.795236E-01
 1992.0000 -0.323811E-01
 1992.0834 -0.127674    
 1992.1666 -0.214419    
 1992.2500 -0.409298E-01
 1992.3334 -0.234883    
 1992.4166 -0.568372    
 1992.5000 -0.217210    
 1992.5834  0.109301E-01
 1992.6666 -0.460233    
 1992.7500 -0.229526    
 1992.8334 -0.419536    
 1992.9166 -0.699524    
 1993.0000 -0.722381    
 1993.0834 -0.617674    
 1993.1666 -0.444419    
 1993.2500 -0.140930    
 1993.3334  0.351171E-01
 1993.4166 -0.198372    
 1993.5000 -0.772095E-01
 1993.5834 -0.229070    
 1993.6666  0.109767    
 1993.7500  0.904741E-01
 1993.8334  0.210464    
 1993.9166 -0.209524    
 1994.0000  0.976188E-01
 1994.0834  0.232326    
 1994.1666  0.515581    
 1994.2500  0.409070    
 1994.3334  0.355117    
 1994.4166  0.161628    
 1994.5000  0.322790    
 1994.5834  0.330930    
 1994.6666  0.197668E-01
 1994.7500 -0.952625E-02
 1994.8334  0.160464    
 1994.9166  0.230476    
 1995.0000  0.457619    
 1995.0834  0.202326    
 1995.1666  0.325581    
 1995.2500  0.359070    
 1995.3334  0.335117    
 1995.4166 -0.108372    
 1995.5000 -0.267210    
 1995.5834  0.409298E-01
 1995.6666 -0.130233    
 1995.7500 -0.509526    
 1995.8334 -0.129536    
 1995.9166  0.310476    
 1996.0000  0.277619    
 1996.0834 -0.217674    
 1996.1666 -0.344186E-01
 1996.2500  0.329070    
 1996.3334  0.795117    
 1996.4166  0.521628    
 1996.5000  0.927906E-01
 1996.5834 -0.259070    
 1996.6666 -0.502329E-01
 1996.7500 -0.139526    
 1996.8334 -0.379536    
 1996.9166 -0.639524    
 1997.0000 -0.502381    
 1997.0834 -0.267674    
 1997.1666 -0.384419    
 1997.2500 -0.200930    
 1997.3334  0.551171E-01
 1997.4166 -0.348372    
 1997.5000 -0.472097E-01
 1997.5834 -0.690699E-01
 1997.6666 -0.232697E-03
 1997.7500  0.404739E-01
 1997.8334 -0.295353E-01
 1997.9166  0.110476    
 1998.0000 -0.232381    
 1998.0834 -0.117674    
 1998.1666  0.255814E-01
 1998.2500  0.790701E-01
 1998.3334  0.551171E-01
 1998.4166 -0.228372    
 1998.5000 -0.137210    
 1998.5834 -0.990696E-01
 1998.6666  0.249767    
 1998.7500  0.460474    
 1998.8334  0.260465    
 1998.9166 -0.795236E-01
 1999.0000 -0.162381    
 1999.0834 -0.217674    
 1999.1666 -0.104419    
 1999.2500  0.890703E-01
 1999.3334  0.215117    
 1999.4166  0.261628    
 1999.5000  0.262791    
 1999.5834  0.809298E-01
 1999.6666  0.297670E-01
 1999.7500  0.150474    
 1999.8334 -0.109535    
 1999.9166 -0.795236E-01
 2000.0000 -0.352381    
 2000.0834 -0.267674    
 2000.1666 -0.144186E-01
 2000.2500  0.269070    
 2000.3334  0.705118    
 2000.4166  0.471628    
 2000.5000  0.192790    
 2000.5834  0.480930    
 2000.6666  0.479767    
 2000.7500  0.180474    
 2000.8334  0.190465    
 2000.9166  0.704761E-01
 2001.0000  0.367619    
 2001.0834  0.452326    
 2001.1666  0.675581    
 2001.2500  0.259070    
 2001.3334  0.145117    
 2001.4166 -0.837135E-02
 2001.5000 -0.217210    
 2001.5834 -0.409070    
 2001.6666 -0.230233    
 2001.7500 -0.739526    
 2001.8334 -0.619535    
 2001.9166 -0.519524    
 2002.0000 -0.322381    
 2002.0834 -0.167674    
 2002.1666 -0.324419    
 2002.2500 -0.450930    
 2002.3334 -0.674883    
 2002.4166 -0.868372    
 2002.5000 -0.277209    
 2002.5834 -0.419070    
 2002.6666 -0.490232    
 2002.7500 -0.259526    
 2002.8334  0.504646E-01
 2002.9166  0.730476    
 2003.0000  0.837619    
 2003.0834  0.672326    
 2003.1666  0.555581    
 2003.2500  0.519070    
 2003.3334  0.595117    
 2003.4166  0.591628    
 2003.5000  0.372790    
 2003.5834 -0.389070    
 2003.6666 -0.450233    
 2003.7500 -0.209526    
 2003.8334 -0.149535    
 2003.9166  0.320476    
 2004.0000  0.527619    
 2004.0834  0.372325    
 2004.1666  0.475581    
 2004.2500  0.349070    
 2004.3334  0.335117    
 2004.4166  0.321629    
 2004.5000  0.362790    
 2004.5834  0.709295E-01
 2004.6666 -0.232697E-03
 2004.7500  0.404739E-01
 2004.8334  0.130465    
 2004.9166  0.504761E-01
 2005.0000 -0.923810E-01
 2005.0834 -0.176744E-01
 2005.1666  0.455813E-01
 2005.2500  0.149070    
 2005.3334  0.105117    
 2005.4166 -0.258371    
 2005.5000 -0.772095E-01
 2005.5834 -0.209070    
 2005.6666  0.259768    
 2005.7500 -0.395260E-01
 2005.8334  0.180465    
 2005.9166 -0.549524    
 2006.0000 -0.462381    
 2006.0834 -0.227674    
 2006.1666 -0.674419    
 2006.2500 -0.760930    
 2006.3334 -0.654883    
 2006.4166  0.116282E-01
 2006.5000  0.827904E-01
 2006.5834  0.380930    
 2006.6666  0.589767    
 2006.7500  0.600474    
 2006.8334 -0.953579E-02
 2006.9166 -0.399524    
 2007.0000 -0.272381    
 2007.0834 -0.476744E-01
 2007.1666 -0.144419    
 2007.2500 -0.340930    
 2007.3334 -0.314883    
 2007.4166 -0.883722E-01
 2007.5000 -0.187210    
 2007.5834 -0.129070    
 2007.6666  0.799767    
 2007.7500  0.510474    
 2007.8334  0.540464    
 2007.9166   1.50048    
 2008.0000  0.797619    
 2008.0834  0.412326    
 2008.1666  0.995581    
 2008.2500   1.18907    
 2008.3334  0.745118    
 2008.4166  0.831628    
 2008.5000  0.152790    
 2008.5834 -0.290699E-01
 2008.6666 -0.200233    
 2008.7500  0.404739E-01
 2008.8334  0.390465    
 2008.9166  0.510476    
 2009.0000  0.227619    
 2009.0834 -0.176744E-01
 2009.1666  0.335581    
 2009.2500  0.919070    
 2009.3334  0.605117    
 2009.4166  0.521628    
 2009.5000  0.292790    
 2009.5834  0.290930    
 2009.6666  0.489767    
 2009.7500  0.270474    
 2009.8334  0.180465    
 2009.9166  0.210476    
 2010.0000  0.576189E-01
 2010.0834  0.122325    
 2010.1666 -0.244186E-01
 2010.2500 -0.409298E-01
 2010.3334  0.475117    
 2010.4166   1.08163    
 2010.5000  0.942790    
 2010.5834  0.790930    
 2010.6666 -0.160233    
 2010.7500  0.330474    
 2010.8334  0.300465    
 2010.9166  0.604763E-01
 2011.0000 -0.222381    
 2011.0834 -0.127674    
 2011.1666 -0.424419    
 2011.2500 -0.650930    
 2011.3334 -0.488281E-02
 2011.4166 -0.283718E-01
 2011.5000 -0.457210    
 2011.5834 -0.119070    
 2011.6666 -0.202332E-01
 2011.7500  0.150474    
 2011.8334  0.150465    
 2011.9166  0.520476    
 2012.0000  0.437619    
 2012.0834  0.202326    
 2012.1666  0.225581    
 2012.2500  0.509070    
 2012.3334  0.295117    
 2012.4166  0.221628    
 2012.5000  0.512791    
 2012.5834  0.400930    
 2012.6666  0.819767    
 2012.7500  0.370474    
 2012.8334  0.450464    
 2012.9166  0.500476    
 2013.0000  0.667619    
 2013.0834  0.592325    
 2013.1666  0.805581    
 2013.2500  0.709070    
 2013.3334  0.635117    
 2013.4166  0.701629    
 2013.5000  0.932790    
 2013.5834  0.970930    
 2013.6666  0.689767    
 2013.7500   1.05047    
 2013.8334   1.15047    
 2013.9166   1.46048    
 2014.0000   1.10762    
 2014.0834  0.662326    
 2014.1666  0.635581    
 2014.2500   1.36907    
 2014.3334   1.17512    
 2014.4166   1.49163    
 2014.5000   1.15279    
 2014.5834  0.940930    
 2014.6666   1.15977    
 2014.7500  0.750474    
 2014.8334  0.640465    
 2014.9166   1.33048    
 2015.0000   1.06762    
 2015.0834  0.552325    
 2015.1666  0.765581    
 2015.2500   1.32907    
 2015.3334   1.35512    
 2015.4166  0.911628    
 2015.5000  0.652790    
 2015.5834 -0.139070    
 2015.6666 -0.140233    
 2015.7500  0.280474    
 2015.8334  0.280464    
 2015.9166  0.210476    
 2016.0000 -0.242381    
 2016.0834 -0.127674    
 2016.1666  0.855813E-01
 2016.2500  0.339070    
 2016.3334  0.551171E-01
 2016.4166  0.416279E-01
 2016.5000 -0.247210    
 2016.5834 -0.179070    
 2016.6666 -0.730233    
 2016.7500  -1.13953    
 2016.8334  -1.77954    
 2016.9166  -1.36952    
 2017.0000 -0.712381    
 2017.0834 -0.347674    
 2017.1666 -0.854419    
 2017.2500  -1.11093    
 2017.3334  -1.02488    
 2017.4166 -0.768372    
 2017.5000 -0.517210    
 2017.5834 -0.539070    
 2017.6666 -0.670233    
 2017.7500 -0.629526    
 2017.8334 -0.709536    
 2017.9166 -0.649524    
 2018.0000 -0.582381    
 2018.0834 -0.357674    
 2018.1666 -0.374419    
 2018.2500 -0.890930    
 2018.3334 -0.704883    
 2018.4166 -0.338372    
 2018.5000 -0.307210    
 2018.5834 -0.149070    
 2018.6666 -0.390233    
 2018.7500 -0.895262E-01
 2018.8334 -0.869535    
 2018.9166  -1.28952    
 2019.0000 -0.612381    
 2019.0834 -0.177675    
 2019.1666 -0.584419    
 2019.2500 -0.860930    
 2019.3334  -1.01488    
 2019.4166 -0.818372    
 2019.5000 -0.467210    
 2019.5834 -0.169070    
 2019.6666  0.976753E-02
 2019.7500 -0.179526    
 2019.8334 -0.429536    
 2019.9166 -0.289524    
 2020.0000 -0.182381    
 2020.0834 -0.157674    
 2020.1666 -0.944188E-01
 2020.2500 -0.230930    
 2020.3334 -0.244883    
 2020.4166  0.216284E-01
 2020.5000 -0.217210    
 2020.5834  0.260930    
 2020.6666  0.499767    
 2020.7500  0.520474    
 2020.8334  0.260465    
 2020.9166 -0.269524    
 2021.0000 -0.422381    
 2021.0834 -0.307675    
 2021.1666  0.105581    
 2021.2500  0.219070    
 2021.3334  0.295117    
 2021.4166  0.411628    
 2021.5000  0.552791    
 2021.5834  0.480930    
 2021.6666 -0.240232