MSGID: 1:317/3 632ca2e0   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    EPOD - a service of USRA   
      
   The Earth Science Picture of the Day (EPOD) highlights the diverse processes   
   and phenomena which shape our planet and our lives. EPOD will collect and   
   archive photos, imagery, graphics, and artwork with short explanatory   
   captions and links exemplifying features within the Earth system. The   
   community is invited to contribute digital imagery, short captions and   
   relevant links.   
      
      
    Frost Crack in Linden Tree   
      
      September 22, 2022   
      
       Dale_H_linden_a   
      
      Photographer:  Dale Hugo   
      
      Summary Author:  Dale Hugo   
      
      This scar running about 10 ft (3 m) on our  linden (or basswood)   
      tree out front is probably a  frost crack. Cracks like this are   
      caused on extremely cold days, usually at night or early morning when   
      it is coldest, as sap under the bark expands enough to cause a rupture   
      or even an explosion, sounding like a gun shot. However, I don’t recall   
      hearing such a retort coming from our linden. But here in northeastern   
      Illinois, temperatures dropped to at least -25 F (-32C) the past   
      several winters. This tree has been in place since 1974, between the   
      sidewalk and the street.   
      
      Often such  scars are attributed to lightning strikes. We had one   
      across the street on a giant cottonwood, but the effect was to kill 1/3   
      of the tree, leaving a scar that never will heal.   
      
      A frost wound is referred to by foresters and arborists as a  frost   
      rib or frost ridge. The split heals and the health of the tree is   
      unaffected. Further evidence is that the scar doesn’t continue up the   
      trunk toward the top of the tree but is localized. This linden was in   
      full flower this past spring and the fragrance was wonderful.   
      Incidentally, the flowers of a linden can be collected to make a   
      fragrant  tea.   
      
      
      Arlington Heights, Illinois Coordinates: 42.0884, -87.9806   
      
      
   Related EPODs   
      
       Frost Crack in Linden Tree  Triboluminescence Observed on Perito   
      Moreno Glacier  Snowflakes on Mount Etna  Ice Crystal Formation   
      on Frozen Soap Bubble  2022 Ice Out Dates for Sebago Lake, Maine   
       Melting Frost on a Windshield   
       More...   
      
   Cryosphere Links   
      
        *  Guide to Frost   
        *  What is the Cryosphere?   
        *  Bentley Snow Crystals   
        *  Glaciers of the World   
        *  Ice, Snow, and Glaciers: The Water Cycle   
        *  The National Snow and Ice Data Center Google Earth Images   
        *  Snow and Ice Crystals   
      
   -   
      Earth Science Picture of the Day is a service of the  Universities   
      Space Research Association.   
      
   https://epod.usra.edu   
       
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