Morphology of bistable 180° phase switches in 18.6‐year induced rainfall over the north‐eastern United States of America

Abstract

Using a novel data presentation technique, bistable 180" phase switches in 18.6-year induced precipitation over the northeastern United States of America are re-examined. It is found that bistable switching in 19-year wavetrains occurred principally at epochs 1898.9, 1917.5, and 1954.7, although some occurred at mid-epoch 1908-2, and at epochs 1936.1 and 1973.3 (epochs are dates of maximum in the luni-solar 18.6-year tide). The 180" phase switch at 1898.9 occurred along the northern Atlantic seaboard, and by epoch 1954.7 this invading 'cell' from the east blanketed virtually the entire region. OBrien and Currie (1988) have provided a construct in mathematical physics which can explain how such sudden readjustments in the standing wave pattern for air pressure occur on subcontinental scales, and such adjustments are found in other climatic parameters such as air temperature and pressure. Results for seven tree-ring chr.onologies in the region are also given, and are found to have serious inconsistencies both among themselves and also with respect to instrumental rain-gauge data.KEY WORDS Luni-solar 18.6-year term in rainfall Bistable 180" phase switches in climate Maximum entropy spectrum analysis

Deterministic signals in Oklahoma and texas precipitation records

“…These observations, familiar to us all, are part of the subject of spectrum analysis. This, and the following paper in this issue on long period deterministic signals in rainfall over the south-central and southeastern United States, are part of a series of papers on these terms in regional data [1][2][3][4][5]. Our results indicate that from 8 to 20 years there are two deterministic signals in climate with periods 19 and 10 to 11 years.…”

“…The phenomenon was subsequently found in a drought index for Beijing, China [47], in air temperature and air pressure worldwide [16], in flood of the St Lawrence and Nile rivers [2,48], in most American rain-gauge records [1][2][3][4][5], and in tree rings from several continents [19]. Currie (unpublished data, 1990) also finds the phenomenon in height of sea level.…”

“…This procedure is identical to that employed by Currie and O'Brien [1][2][3][4][5] for other American predpi- tation records, and by Currie [19] for tree-ring chronologies from Tasmania and New Zealand. Figure 4a displays the mean wavetrain for 21 records whose dates of maxima and minima were similar.…”

“…Currie and O'Brien [2] (Figures 6-9) provided a novel and easy-to-understand mode of data display for north-eastern U.S. rain-gauge data. For epochs 1843.0 through 1973.3, and at mid-epochs, they plotted on a map the polarity of each wave at each site.…”

“…More recently, the terms in rainfall have been reported over various regions of the United States [2][3][4][5], in the United Kingdom [17], and in Argentina [18]. Currie's earlier work on American tree rings has been extended to New Zealand, Tasmania, and South Africa [19].…”