Also, global climate change is expected to produce in Beijing higher temperatures and humidity with little wind, as well as erratic rainfall, resulting in more frequent periods with hazardous air pollution with periodic drought and flash flood conditions [14].
But his career is still marked by frequent periods of self-doubt.
Their relationship, then as now, survived his frequent periods of absence.
In 1917 he was diagnosed as having tuberculosis, and from then onward he spent frequent periods in sanatoriums.
There have of course been frequent periods of war and upheaval which have produced large numbers of refugees – the Syria crisis is just the latest example of this.
The subsequent 30 years saw a widening in income inequality, rising debt, weaker trade unions and increasingly frequent periods of financial instability.
They and their ancestors, who trace their origins to the Celtic druids, have lived through frequent periods of hunger, a terrible flood and two cholera epidemics.
Thus, the oceans experienced frequent periods of anoxic (oxygenless) conditions in the bottom waters that reveal themselves today as black shales.
Other thermal patterns are monomixis, in which a single annual period of circulation alternates with a single thermal stratification event, and polymixis, in which frequent periods of stratification occur.
