frost ring

frost ring

[′frȯst ‚riŋ]
(botany)
A false annual growth ring in the trunk of a tree due to out-of-season defoliation by frost and subsequent regrowth of foliage.
References in periodicals archive ?
frost ring ice acid date or historical eruption 1965 1963/5 GISP2 and Crete 1941 - 1912 1912 GISP2 and Crete 1902 1902 GISP2 1884 1883 GISP2 and Crete 1866 - 1837 1835 Coseguina VEI 5 1831 1831 GISP2 1828 - 1817 1815 GISP2 and Crete 1805 - 1761 1760-61 Makian VEI 4 1732 1730-36 Crete 1680 1680 Tongkoko VEI ?
1997), in the period since AD 550 there have been at least 83 eruptions [greater than or equal to] VEI4, where only 31 frost ring events have been identified (a 37% presumed association).
The weather gets cold and leaves a frost ring in the trees.
It should have been apparent that these bore an uncanny resemblance to the 43 BC, 1627 BC and 2036 BC frost ring dates; but Johnsen et al.
In 1984 LaMarche and Hirschboeck suggested that frost rings in bristlecone pines were sometimes due to climatic upset caused by explosive volcanism.
Frost rings in trees as records of major volcanic eruptions.
7 years to make AD 533-4 equivalent to 536; (c) same dates as (a) moved forward by 7 years to bring them into line with tree-ring evidence; (d) severe reduced growth in temperature sensitive Swedish pines; (e) frost rings in American bristlecone pines.
A dendrochronologist must be able to read micro-rings just two cells wide, false rings embedded in a single annual ring, fuzzy ring boundaries in tropical trees, missing rings, pinched rings that are missing part of their circumference, frost rings formed from freezing temperatures during the growing season, and fire scars that lack telltale charcoal.
The fact that we see no frost rings and that the growth rings are so wide suggests that conditions were not marginal.
Also, Taylor found no frost rings, the telltale signs of freezing conditions.
LaMarche & Hirschboeck (1984) had noted a series of frost rings in the bristlecone pine tree-ring sequences from the southwestern USA.