"upsurge trend" is a correct and usable phrase in written English.
It is commonly used to refer to an increase in activity, frequency, or quantity. For example, "There has been an upsurge trend in the number of students enrolling in after-school science classes this year."
On February 4, 2008, the predicted probability of alert reaches a height of 91.08%, whereas the observed upsurge trend of ILI visits takes place on February 6, the Chinese New Year eve.
Outbreaks of HFMD peaks in the warmer season of the year, but the underlying factors for this annual pattern and the reasons to the recent upsurge trend have not yet been established.
I've loved, in particular, one heartening trend countering the upsurge of xenophobia: this year's bonanza of English-language fiction published by writers of Asian descent. .
I've loved, in particular, one heartening trend countering the upsurge of xenophobia: this year's bonanza of English-language fiction published by writers of Asian descent.
This trend was associated with comparable upsurges in the xylem sap.
The 1990s also saw an upsurge in collaborations by Morrison with other artists, a trend continuing into the new millennium.
And scholars have noted in recent years an upsurge in interest in all manner of spiritual topics, a trend reflected in popular entertainment, especially on television.
Yet the huge upsurge in international days is definitely a modern phenomenon, as the trend benefits marketers, social media editors and content-creating journalists and YouTubers.
Such trends are of interest in light of the recent upsurge of Ukrainian nationalism often associated with the Maidan protests which removed the unpopular Viktor Yanukovych government from power.
The upsurge in support for Islamist politics is the confluence of two trends -- a repudiation of the disastrous policies of past regimes and a growing view among Muslims that Sharia can be an effective bulwark against the oppressive corruption and monopolization of power by the elite.
But earlier this week, the comet's brightening trend again seemed to sputtering and stalling, but more recent observations suggest a sudden and radical upsurge in brightness.
