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        <span style="font-size:14px;font-family:Verdana;">Hi all, </span>
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        <br>
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        <span style="font-size:14px;font-family:Verdana;">I am trying to calculate the tropopause pressure with the built-in function trop_wmo, but got some abnormal values (equal to 85 hPa or -999 hPa) when using the </span><span style="font-family:Verdana;font-size:14px;">monthly temperature from NCEP/NCAR reanalysis 1 (17 levels between 1000 hPa and 10 hPa)</span><span style="font-size:14px;font-family:Verdana;">.  </span><span style="font-family:Verdana;font-size:14px;">It seems like that this problem is related to the vertical resolution of the input temperature. If I use the ERA-interim reanalysis data (32 levels between 1000 hPa and 10 hPa), the abnormal values are non-existent.  Does the function trop_wmo not apply to the renanlysis data with coarse resolution? Any help on how to fix this problem? </span>
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        <span style="font-family:Verdana;font-size:14px;">Attached are my ncl script and input data.</span>
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        <span style="font-family:Verdana;font-size:14px;"><br>
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        <span style="font-family:Verdana;font-size:14px;">Thanks</span>
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        <span style="font-family:Verdana;font-size:14px;">Wang Na</span>
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